src/network/networkd-link.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <netinet/in.h>
   4 #include <linux/if.h>
   5 #include <linux/if_arp.h>
   6 #include <unistd.h>
   7
   8 #include "alloc-util.h"
   9 #include "bond.h"
  10 #include "bridge.h"
  11 #include "bus-util.h"
  12 #include "dhcp-identifier.h"
  13 #include "dhcp-lease-internal.h"
  14 #include "env-file.h"
  15 #include "ethtool-util.h"
  16 #include "fd-util.h"
  17 #include "fileio.h"
  18 #include "ipvlan.h"
  19 #include "missing_network.h"
  20 #include "netlink-util.h"
  21 #include "network-internal.h"
  22 #include "networkd-can.h"
  23 #include "networkd-dhcp-server.h"
  24 #include "networkd-dhcp4.h"
  25 #include "networkd-dhcp6.h"
  26 #include "networkd-ipv4ll.h"
  27 #include "networkd-ipv6-proxy-ndp.h"
  28 #include "networkd-link-bus.h"
  29 #include "networkd-link.h"
  30 #include "networkd-lldp-tx.h"
  31 #include "networkd-manager.h"
  32 #include "networkd-ndisc.h"
  33 #include "networkd-neighbor.h"
  34 #include "networkd-radv.h"
  35 #include "networkd-routing-policy-rule.h"
  36 #include "networkd-wifi.h"
  37 #include "set.h"
  38 #include "socket-util.h"
  39 #include "stat-util.h"
  40 #include "stdio-util.h"
  41 #include "string-table.h"
  42 #include "strv.h"
  43 #include "sysctl-util.h"
  44 #include "tc.h"
  45 #include "tmpfile-util.h"
  46 #include "udev-util.h"
  47 #include "util.h"
  48 #include "vrf.h"
  49
  50 uint32_t link_get_vrf_table(Link *link) {
  51         return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
  52 }
  53
  54 uint32_t link_get_dhcp_route_table(Link *link) {
  55         /* When the interface is part of an VRF use the VRFs routing table, unless
  56          * another table is explicitly specified. */
  57         if (link->network->dhcp_route_table_set)
  58                 return link->network->dhcp_route_table;
  59         return link_get_vrf_table(link);
  60 }
  61
  62 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
  63         if (link->network->ipv6_accept_ra_route_table_set)
  64                 return link->network->ipv6_accept_ra_route_table;
  65         return link_get_vrf_table(link);
  66 }
  67
  68 DUID* link_get_duid(Link *link) {
  69         if (link->network->duid.type != _DUID_TYPE_INVALID)
  70                 return &link->network->duid;
  71         else
  72                 return &link->manager->duid;
  73 }
  74
  75 static bool link_dhcp6_enabled(Link *link) {
  76         assert(link);
  77
  78         if (!socket_ipv6_is_supported())
  79                 return false;
  80
  81         if (link->flags & IFF_LOOPBACK)
  82                 return false;
  83
  84         if (!link->network)
  85                 return false;
  86
  87         if (link->network->bond)
  88                 return false;
  89
  90         if (link->iftype == ARPHRD_CAN)
  91                 return false;
  92
  93         return link->network->dhcp & ADDRESS_FAMILY_IPV6;
  94 }
  95
  96 static bool link_dhcp4_enabled(Link *link) {
  97         assert(link);
  98
  99         if (link->flags & IFF_LOOPBACK)
 100                 return false;
 101
 102         if (!link->network)
 103                 return false;
 104
 105         if (link->network->bond)
 106                 return false;
 107
 108         if (link->iftype == ARPHRD_CAN)
 109                 return false;
 110
 111         return link->network->dhcp & ADDRESS_FAMILY_IPV4;
 112 }
 113
 114 static bool link_dhcp4_server_enabled(Link *link) {
 115         assert(link);
 116
 117         if (link->flags & IFF_LOOPBACK)
 118                 return false;
 119
 120         if (!link->network)
 121                 return false;
 122
 123         if (link->network->bond)
 124                 return false;
 125
 126         if (link->iftype == ARPHRD_CAN)
 127                 return false;
 128
 129         return link->network->dhcp_server;
 130 }
 131
 132 bool link_ipv4ll_enabled(Link *link, AddressFamily mask) {
 133         assert(link);
 134         assert((mask & ~(ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) == 0);
 135
 136         if (link->flags & IFF_LOOPBACK)
 137                 return false;
 138
 139         if (!link->network)
 140                 return false;
 141
 142         if (link->iftype == ARPHRD_CAN)
 143                 return false;
 144
 145         if (STRPTR_IN_SET(link->kind,
 146                           "vrf", "wireguard", "ipip", "gre", "ip6gre","ip6tnl", "sit", "vti",
 147                           "vti6", "nlmon", "xfrm"))
 148                 return false;
 149
 150         /* L3 or L3S mode do not support ARP. */
 151         if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S))
 152                 return false;
 153
 154         if (link->network->bond)
 155                 return false;
 156
 157         return link->network->link_local & mask;
 158 }
 159
 160 static bool link_ipv6ll_enabled(Link *link) {
 161         assert(link);
 162
 163         if (!socket_ipv6_is_supported())
 164                 return false;
 165
 166         if (link->flags & IFF_LOOPBACK)
 167                 return false;
 168
 169         if (!link->network)
 170                 return false;
 171
 172         if (link->iftype == ARPHRD_CAN)
 173                 return false;
 174
 175         if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "sit", "vti", "nlmon"))
 176                 return false;
 177
 178         if (link->network->bond)
 179                 return false;
 180
 181         return link->network->link_local & ADDRESS_FAMILY_IPV6;
 182 }
 183
 184 static bool link_ipv6_enabled(Link *link) {
 185         assert(link);
 186
 187         if (!socket_ipv6_is_supported())
 188                 return false;
 189
 190         if (link->network->bond)
 191                 return false;
 192
 193         if (link->iftype == ARPHRD_CAN)
 194                 return false;
 195
 196         /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
 197         if (link_ipv6ll_enabled(link))
 198                 return true;
 199
 200         if (network_has_static_ipv6_configurations(link->network))
 201                 return true;
 202
 203         return false;
 204 }
 205
 206 static bool link_radv_enabled(Link *link) {
 207         assert(link);
 208
 209         if (!link_ipv6ll_enabled(link))
 210                 return false;
 211
 212         return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
 213 }
 214
 215 static bool link_ipv4_forward_enabled(Link *link) {
 216         assert(link);
 217
 218         if (link->flags & IFF_LOOPBACK)
 219                 return false;
 220
 221         if (!link->network)
 222                 return false;
 223
 224         if (link->network->ip_forward == _ADDRESS_FAMILY_INVALID)
 225                 return false;
 226
 227         return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
 228 }
 229
 230 static bool link_ipv6_forward_enabled(Link *link) {
 231         assert(link);
 232
 233         if (!socket_ipv6_is_supported())
 234                 return false;
 235
 236         if (link->flags & IFF_LOOPBACK)
 237                 return false;
 238
 239         if (!link->network)
 240                 return false;
 241
 242         if (link->network->ip_forward == _ADDRESS_FAMILY_INVALID)
 243                 return false;
 244
 245         return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
 246 }
 247
 248 static bool link_proxy_arp_enabled(Link *link) {
 249         assert(link);
 250
 251         if (link->flags & IFF_LOOPBACK)
 252                 return false;
 253
 254         if (!link->network)
 255                 return false;
 256
 257         if (link->network->proxy_arp < 0)
 258                 return false;
 259
 260         return true;
 261 }
 262
 263 static bool link_ipv6_accept_ra_enabled(Link *link) {
 264         assert(link);
 265
 266         if (!socket_ipv6_is_supported())
 267                 return false;
 268
 269         if (link->flags & IFF_LOOPBACK)
 270                 return false;
 271
 272         if (!link->network)
 273                 return false;
 274
 275         if (!link_ipv6ll_enabled(link))
 276                 return false;
 277
 278         /* If unset use system default (enabled if local forwarding is disabled.
 279          * disabled if local forwarding is enabled).
 280          * If set, ignore or enforce RA independent of local forwarding state.
 281          */
 282         if (link->network->ipv6_accept_ra < 0)
 283                 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
 284                 return !link_ipv6_forward_enabled(link);
 285         else if (link->network->ipv6_accept_ra > 0)
 286                 /* accept RA even if ip_forward is enabled */
 287                 return true;
 288         else
 289                 /* ignore RA */
 290                 return false;
 291 }
 292
 293 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
 294         assert(link);
 295
 296         if (!socket_ipv6_is_supported())
 297                 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
 298
 299         if (link->flags & IFF_LOOPBACK)
 300                 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
 301
 302         if (!link->network)
 303                 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
 304
 305         return link->network->ipv6_privacy_extensions;
 306 }
 307
 308 static int link_update_ipv6_sysctl(Link *link) {
 309         bool enabled;
 310         int r;
 311
 312         if (link->flags & IFF_LOOPBACK)
 313                 return 0;
 314
 315         enabled = link_ipv6_enabled(link);
 316         if (enabled) {
 317                 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", false);
 318                 if (r < 0)
 319                         return log_link_warning_errno(link, r, "Cannot enable IPv6: %m");
 320
 321                 log_link_info(link, "IPv6 successfully enabled");
 322         }
 323
 324         return 0;
 325 }
 326
 327 static bool link_is_enslaved(Link *link) {
 328         if (link->flags & IFF_SLAVE)
 329                 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
 330                 return true;
 331
 332         if (!link->network)
 333                 return false;
 334
 335         if (link->master_ifindex > 0 && link->network->bridge)
 336                 return true;
 337
 338         /* TODO: add conditions for other netdevs. */
 339
 340         return false;
 341 }
 342
 343 static void link_update_master_operstate(Link *link, NetDev *netdev) {
 344         Link *master;
 345
 346         if (!netdev)
 347                 return;
 348
 349         if (netdev->ifindex <= 0)
 350                 return;
 351
 352         if (link_get(link->manager, netdev->ifindex, &master) < 0)
 353                 return;
 354
 355         link_update_operstate(master, true);
 356 }
 357
 358 void link_update_operstate(Link *link, bool also_update_master) {
 359         LinkOperationalState operstate;
 360         LinkCarrierState carrier_state;
 361         LinkAddressState address_state;
 362         _cleanup_strv_free_ char **p = NULL;
 363         uint8_t scope = RT_SCOPE_NOWHERE;
 364         bool changed = false;
 365         Address *address;
 366         Iterator i;
 367
 368         assert(link);
 369
 370         if (link->kernel_operstate == IF_OPER_DORMANT)
 371                 carrier_state = LINK_CARRIER_STATE_DORMANT;
 372         else if (link_has_carrier(link)) {
 373                 if (link_is_enslaved(link))
 374                         carrier_state = LINK_CARRIER_STATE_ENSLAVED;
 375                 else
 376                         carrier_state = LINK_CARRIER_STATE_CARRIER;
 377         } else if (link->flags & IFF_UP)
 378                 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
 379         else
 380                 carrier_state = LINK_CARRIER_STATE_OFF;
 381
 382         if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
 383                 Link *slave;
 384
 385                 SET_FOREACH(slave, link->slaves, i) {
 386                         link_update_operstate(slave, false);
 387
 388                         if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
 389                                 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
 390                 }
 391         }
 392
 393         SET_FOREACH(address, link->addresses, i) {
 394                 if (!address_is_ready(address))
 395                         continue;
 396
 397                 if (address->scope < scope)
 398                         scope = address->scope;
 399         }
 400
 401         /* for operstate we also take foreign addresses into account */
 402         SET_FOREACH(address, link->addresses_foreign, i) {
 403                 if (!address_is_ready(address))
 404                         continue;
 405
 406                 if (address->scope < scope)
 407                         scope = address->scope;
 408         }
 409
 410         if (scope < RT_SCOPE_SITE)
 411                 /* universally accessible addresses found */
 412                 address_state = LINK_ADDRESS_STATE_ROUTABLE;
 413         else if (scope < RT_SCOPE_HOST)
 414                 /* only link or site local addresses found */
 415                 address_state = LINK_ADDRESS_STATE_DEGRADED;
 416         else
 417                 /* no useful addresses found */
 418                 address_state = LINK_ADDRESS_STATE_OFF;
 419
 420         /* Mapping of address and carrier state vs operational state
 421          *                                                     carrier state
 422          *                          | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
 423          *                 ------------------------------------------------------------------------------
 424          *                 off      | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
 425          * address_state   degraded | off | no-carrier | dormant | degraded-carrier | degraded | enslaved
 426          *                 routable | off | no-carrier | dormant | degraded-carrier | routable | routable
 427          */
 428
 429         if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
 430                 operstate = (LinkOperationalState) carrier_state;
 431         else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
 432                 operstate = LINK_OPERSTATE_ROUTABLE;
 433         else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
 434                 operstate = LINK_OPERSTATE_DEGRADED;
 435         else
 436                 operstate = LINK_OPERSTATE_ENSLAVED;
 437
 438         if (link->carrier_state != carrier_state) {
 439                 link->carrier_state = carrier_state;
 440                 changed = true;
 441                 if (strv_extend(&p, "CarrierState") < 0)
 442                         log_oom();
 443         }
 444
 445         if (link->address_state != address_state) {
 446                 link->address_state = address_state;
 447                 changed = true;
 448                 if (strv_extend(&p, "AddressState") < 0)
 449                         log_oom();
 450         }
 451
 452         if (link->operstate != operstate) {
 453                 link->operstate = operstate;
 454                 changed = true;
 455                 if (strv_extend(&p, "OperationalState") < 0)
 456                         log_oom();
 457         }
 458
 459         if (p)
 460                 link_send_changed_strv(link, p);
 461         if (changed)
 462                 link_dirty(link);
 463
 464         if (also_update_master && link->network) {
 465                 link_update_master_operstate(link, link->network->bond);
 466                 link_update_master_operstate(link, link->network->bridge);
 467         }
 468 }
 469
 470 #define FLAG_STRING(string, flag, old, new) \
 471         (((old ^ new) & flag) \
 472                 ? ((old & flag) ? (" -" string) : (" +" string)) \
 473                 : "")
 474
 475 static int link_update_flags(Link *link, sd_netlink_message *m, bool force_update_operstate) {
 476         unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
 477         uint8_t operstate;
 478         int r;
 479
 480         assert(link);
 481
 482         r = sd_rtnl_message_link_get_flags(m, &flags);
 483         if (r < 0)
 484                 return log_link_warning_errno(link, r, "Could not get link flags: %m");
 485
 486         r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
 487         if (r < 0)
 488                 /* if we got a message without operstate, take it to mean
 489                    the state was unchanged */
 490                 operstate = link->kernel_operstate;
 491
 492         if (!force_update_operstate && (link->flags == flags) && (link->kernel_operstate == operstate))
 493                 return 0;
 494
 495         if (link->flags != flags) {
 496                 log_link_debug(link, "Flags change:%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
 497                                FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
 498                                FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
 499                                FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
 500                                FLAG_STRING("UP", IFF_UP, link->flags, flags),
 501                                FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
 502                                FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
 503                                FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
 504                                FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
 505                                FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
 506                                FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
 507                                FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
 508                                FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
 509                                FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
 510                                FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
 511                                FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
 512                                FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
 513                                FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
 514                                FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
 515                                FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
 516
 517                 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
 518                                   IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
 519                                   IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
 520                                   IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
 521                                   IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
 522                                   IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
 523                 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
 524                 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
 525
 526                 /* link flags are currently at most 18 bits, let's align to
 527                  * printing 20 */
 528                 if (unknown_flags_added)
 529                         log_link_debug(link,
 530                                        "Unknown link flags gained: %#.5x (ignoring)",
 531                                        unknown_flags_added);
 532
 533                 if (unknown_flags_removed)
 534                         log_link_debug(link,
 535                                        "Unknown link flags lost: %#.5x (ignoring)",
 536                                        unknown_flags_removed);
 537         }
 538
 539         link->flags = flags;
 540         link->kernel_operstate = operstate;
 541
 542         link_update_operstate(link, true);
 543
 544         return 0;
 545 }
 546
 547 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
 548         _cleanup_(link_unrefp) Link *link = NULL;
 549         const char *ifname, *kind = NULL;
 550         unsigned short iftype;
 551         int r, ifindex;
 552         uint16_t type;
 553
 554         assert(manager);
 555         assert(message);
 556         assert(ret);
 557
 558         /* check for link kind */
 559         r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
 560         if (r == 0) {
 561                 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
 562                 r = sd_netlink_message_exit_container(message);
 563                 if (r < 0)
 564                         return r;
 565         }
 566
 567         r = sd_netlink_message_get_type(message, &type);
 568         if (r < 0)
 569                 return r;
 570         else if (type != RTM_NEWLINK)
 571                 return -EINVAL;
 572
 573         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 574         if (r < 0)
 575                 return r;
 576         else if (ifindex <= 0)
 577                 return -EINVAL;
 578
 579         r = sd_rtnl_message_link_get_type(message, &iftype);
 580         if (r < 0)
 581                 return r;
 582
 583         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
 584         if (r < 0)
 585                 return r;
 586
 587         link = new(Link, 1);
 588         if (!link)
 589                 return -ENOMEM;
 590
 591         *link = (Link) {
 592                 .n_ref = 1,
 593                 .manager = manager,
 594                 .state = LINK_STATE_PENDING,
 595                 .ifindex = ifindex,
 596                 .iftype = iftype,
 597
 598                 .n_dns = (unsigned) -1,
 599                 .dns_default_route = -1,
 600                 .llmnr = _RESOLVE_SUPPORT_INVALID,
 601                 .mdns = _RESOLVE_SUPPORT_INVALID,
 602                 .dnssec_mode = _DNSSEC_MODE_INVALID,
 603                 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
 604         };
 605
 606         link->ifname = strdup(ifname);
 607         if (!link->ifname)
 608                 return -ENOMEM;
 609
 610         if (kind) {
 611                 link->kind = strdup(kind);
 612                 if (!link->kind)
 613                         return -ENOMEM;
 614         }
 615
 616         r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
 617         if (r < 0)
 618                 log_link_debug_errno(link, r, "New device has no master, continuing without");
 619
 620         r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
 621         if (r < 0)
 622                 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
 623
 624         r = ethtool_get_permanent_macaddr(&manager->ethtool_fd, link->ifname, &link->permanent_mac);
 625         if (r < 0)
 626                 log_link_debug_errno(link, r, "Permanent MAC address not found for new device, continuing without: %m");
 627
 628         r = ethtool_get_driver(&manager->ethtool_fd, link->ifname, &link->driver);
 629         if (r < 0)
 630                 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
 631
 632         r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &link->alternative_names);
 633         if (r < 0 && r != -ENODATA)
 634                 return r;
 635
 636         if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
 637                 return -ENOMEM;
 638
 639         if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
 640                 return -ENOMEM;
 641
 642         if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
 643                 return -ENOMEM;
 644
 645         r = hashmap_ensure_allocated(&manager->links, NULL);
 646         if (r < 0)
 647                 return r;
 648
 649         r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
 650         if (r < 0)
 651                 return r;
 652
 653         r = link_update_flags(link, message, false);
 654         if (r < 0)
 655                 return r;
 656
 657         *ret = TAKE_PTR(link);
 658
 659         return 0;
 660 }
 661
 662 void link_ntp_settings_clear(Link *link) {
 663         link->ntp = strv_free(link->ntp);
 664 }
 665
 666 void link_dns_settings_clear(Link *link) {
 667         link->dns = mfree(link->dns);
 668         link->n_dns = (unsigned) -1;
 669
 670         link->search_domains = ordered_set_free_free(link->search_domains);
 671         link->route_domains = ordered_set_free_free(link->route_domains);
 672
 673         link->dns_default_route = -1;
 674         link->llmnr = _RESOLVE_SUPPORT_INVALID;
 675         link->mdns = _RESOLVE_SUPPORT_INVALID;
 676         link->dnssec_mode = _DNSSEC_MODE_INVALID;
 677         link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
 678
 679         link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
 680 }
 681
 682 static void link_free_engines(Link *link) {
 683         if (!link)
 684                 return;
 685
 686         link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
 687         link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client);
 688         link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
 689         link->dhcp_routes = set_free(link->dhcp_routes);
 690
 691         link->lldp = sd_lldp_unref(link->lldp);
 692
 693         ndisc_flush(link);
 694
 695         link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll);
 696         link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
 697         link->ndisc = sd_ndisc_unref(link->ndisc);
 698         link->radv = sd_radv_unref(link->radv);
 699 }
 700
 701 static Link *link_free(Link *link) {
 702         Address *address;
 703
 704         assert(link);
 705
 706         link_ntp_settings_clear(link);
 707         link_dns_settings_clear(link);
 708
 709         link->routes = set_free_with_destructor(link->routes, route_free);
 710         link->routes_foreign = set_free_with_destructor(link->routes_foreign, route_free);
 711
 712         link->nexthops = set_free_with_destructor(link->nexthops, nexthop_free);
 713         link->nexthops_foreign = set_free_with_destructor(link->nexthops_foreign, nexthop_free);
 714
 715         link->neighbors = set_free_with_destructor(link->neighbors, neighbor_free);
 716         link->neighbors_foreign = set_free_with_destructor(link->neighbors_foreign, neighbor_free);
 717
 718         link->addresses = set_free_with_destructor(link->addresses, address_free);
 719         link->addresses_foreign = set_free_with_destructor(link->addresses_foreign, address_free);
 720
 721         while ((address = link->pool_addresses)) {
 722                 LIST_REMOVE(addresses, link->pool_addresses, address);
 723                 address_free(address);
 724         }
 725
 726         link_lldp_emit_stop(link);
 727         link_free_engines(link);
 728         free(link->lease_file);
 729         free(link->lldp_file);
 730
 731         free(link->ifname);
 732         strv_free(link->alternative_names);
 733         free(link->kind);
 734         free(link->ssid);
 735         free(link->driver);
 736
 737         (void) unlink(link->state_file);
 738         free(link->state_file);
 739
 740         sd_device_unref(link->sd_device);
 741
 742         hashmap_free(link->bound_to_links);
 743         hashmap_free(link->bound_by_links);
 744
 745         set_free_with_destructor(link->slaves, link_unref);
 746
 747         network_unref(link->network);
 748
 749         return mfree(link);
 750 }
 751
 752 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
 753
 754 int link_get(Manager *m, int ifindex, Link **ret) {
 755         Link *link;
 756
 757         assert(m);
 758         assert(ifindex > 0);
 759         assert(ret);
 760
 761         link = hashmap_get(m->links, INT_TO_PTR(ifindex));
 762         if (!link)
 763                 return -ENODEV;
 764
 765         *ret = link;
 766
 767         return 0;
 768 }
 769
 770 void link_set_state(Link *link, LinkState state) {
 771         assert(link);
 772
 773         if (link->state == state)
 774                 return;
 775
 776         log_link_debug(link, "State changed: %s -> %s",
 777                        link_state_to_string(link->state),
 778                        link_state_to_string(state));
 779
 780         link->state = state;
 781
 782         link_send_changed(link, "AdministrativeState", NULL);
 783 }
 784
 785 static void link_enter_unmanaged(Link *link) {
 786         assert(link);
 787
 788         link_set_state(link, LINK_STATE_UNMANAGED);
 789
 790         link_dirty(link);
 791 }
 792
 793 int link_stop_clients(Link *link, bool may_keep_dhcp) {
 794         int r = 0, k;
 795         Address *ad;
 796
 797         assert(link);
 798         assert(link->manager);
 799         assert(link->manager->event);
 800
 801         dhcp4_release_old_lease(link);
 802
 803         bool keep_dhcp = may_keep_dhcp &&
 804                          link->network &&
 805                          (link->manager->restarting ||
 806                           FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
 807
 808         if (link->dhcp_client && !keep_dhcp) {
 809                 k = sd_dhcp_client_stop(link->dhcp_client);
 810                 if (k < 0)
 811                         r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
 812         }
 813
 814         if (link->ipv4ll) {
 815                 k = sd_ipv4ll_stop(link->ipv4ll);
 816                 if (k < 0)
 817                         r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
 818         }
 819
 820         if (link->network)
 821                 LIST_FOREACH(addresses, ad, link->network->static_addresses)
 822                         if (ad->acd && sd_ipv4acd_is_running(ad->acd) == 0) {
 823                                 k = sd_ipv4acd_stop(ad->acd);
 824                                 if (k < 0)
 825                                         r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client: %m");
 826                         }
 827
 828         if (link->dhcp6_client) {
 829                 k = sd_dhcp6_client_stop(link->dhcp6_client);
 830                 if (k < 0)
 831                         r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
 832         }
 833
 834         if (link->ndisc) {
 835                 k = sd_ndisc_stop(link->ndisc);
 836                 if (k < 0)
 837                         r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
 838         }
 839
 840         if (link->radv) {
 841                 k = sd_radv_stop(link->radv);
 842                 if (k < 0)
 843                         r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
 844         }
 845
 846         link_lldp_emit_stop(link);
 847         return r;
 848 }
 849
 850 void link_enter_failed(Link *link) {
 851         assert(link);
 852
 853         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 854                 return;
 855
 856         log_link_warning(link, "Failed");
 857
 858         link_set_state(link, LINK_STATE_FAILED);
 859
 860         link_stop_clients(link, false);
 861
 862         link_dirty(link);
 863 }
 864
 865 static int link_join_netdevs_after_configured(Link *link) {
 866         NetDev *netdev;
 867         Iterator i;
 868         int r;
 869
 870         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
 871                 if (netdev->ifindex > 0)
 872                         /* Assume already enslaved. */
 873                         continue;
 874
 875                 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
 876                         continue;
 877
 878                 log_struct(LOG_DEBUG,
 879                            LOG_LINK_INTERFACE(link),
 880                            LOG_NETDEV_INTERFACE(netdev),
 881                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
 882
 883                 r = netdev_join(netdev, link, NULL);
 884                 if (r < 0)
 885                         return log_struct_errno(LOG_WARNING, r,
 886                                                 LOG_LINK_INTERFACE(link),
 887                                                 LOG_NETDEV_INTERFACE(netdev),
 888                                                 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
 889         }
 890
 891         return 0;
 892 }
 893
 894 static void link_enter_configured(Link *link) {
 895         assert(link);
 896         assert(link->network);
 897
 898         if (link->state != LINK_STATE_CONFIGURING)
 899                 return;
 900
 901         link_set_state(link, LINK_STATE_CONFIGURED);
 902
 903         (void) link_join_netdevs_after_configured(link);
 904
 905         link_dirty(link);
 906 }
 907
 908 static int link_request_set_routing_policy_rule(Link *link) {
 909         RoutingPolicyRule *rule, *rrule = NULL;
 910         int r;
 911
 912         assert(link);
 913         assert(link->network);
 914
 915         link->routing_policy_rules_configured = false;
 916
 917         LIST_FOREACH(rules, rule, link->network->rules) {
 918                 r = routing_policy_rule_get(link->manager, rule, &rrule);
 919                 if (r >= 0) {
 920                         if (r == 0)
 921                                 (void) routing_policy_rule_make_local(link->manager, rrule);
 922                         continue;
 923                 }
 924
 925                 r = routing_policy_rule_configure(rule, link, NULL);
 926                 if (r < 0)
 927                         return log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
 928                 if (r > 0)
 929                         link->routing_policy_rule_messages++;
 930         }
 931
 932         routing_policy_rule_purge(link->manager, link);
 933         if (link->routing_policy_rule_messages == 0) {
 934                 link->routing_policy_rules_configured = true;
 935                 link_check_ready(link);
 936         } else {
 937                 log_link_debug(link, "Setting routing policy rules");
 938                 link_set_state(link, LINK_STATE_CONFIGURING);
 939         }
 940
 941         return 0;
 942 }
 943
 944 static int nexthop_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 945         int r;
 946
 947         assert(link);
 948         assert(link->nexthop_messages > 0);
 949         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
 950                       LINK_STATE_FAILED, LINK_STATE_LINGER));
 951
 952         link->nexthop_messages--;
 953
 954         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 955                 return 1;
 956
 957         r = sd_netlink_message_get_errno(m);
 958         if (r < 0 && r != -EEXIST) {
 959                 log_link_message_warning_errno(link, m, r, "Could not set nexthop");
 960                 link_enter_failed(link);
 961                 return 1;
 962         }
 963
 964         if (link->nexthop_messages == 0) {
 965                 log_link_debug(link, "Nexthop set");
 966                 link->static_nexthops_configured = true;
 967                 link_check_ready(link);
 968         }
 969
 970         return 1;
 971 }
 972
 973 int link_request_set_nexthop(Link *link) {
 974         NextHop *nh;
 975         int r;
 976
 977         LIST_FOREACH(nexthops, nh, link->network->static_nexthops) {
 978                 r = nexthop_configure(nh, link, nexthop_handler);
 979                 if (r < 0)
 980                         return log_link_warning_errno(link, r, "Could not set nexthop: %m");
 981                 if (r > 0)
 982                         link->nexthop_messages++;
 983         }
 984
 985         if (link->nexthop_messages == 0) {
 986                 link->static_nexthops_configured = true;
 987                 link_check_ready(link);
 988         } else {
 989                 log_link_debug(link, "Setting nexthop");
 990                 link_set_state(link, LINK_STATE_CONFIGURING);
 991         }
 992
 993         return 1;
 994 }
 995
 996 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 997         int r;
 998
 999         assert(link);
1000         assert(link->route_messages > 0);
1001         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1002                       LINK_STATE_FAILED, LINK_STATE_LINGER));
1003
1004         link->route_messages--;
1005
1006         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1007                 return 1;
1008
1009         r = sd_netlink_message_get_errno(m);
1010         if (r < 0 && r != -EEXIST) {
1011                 log_link_message_warning_errno(link, m, r, "Could not set route");
1012                 link_enter_failed(link);
1013                 return 1;
1014         }
1015
1016         if (link->route_messages == 0) {
1017                 log_link_debug(link, "Routes set");
1018                 link->static_routes_configured = true;
1019                 link_check_ready(link);
1020         }
1021
1022         return 1;
1023 }
1024
1025 int link_request_set_routes(Link *link) {
1026         enum {
1027                 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
1028                 PHASE_GATEWAY,     /* Second phase: Routes with a gateway */
1029                 _PHASE_MAX
1030         } phase;
1031         Route *rt;
1032         int r;
1033
1034         assert(link);
1035         assert(link->network);
1036         assert(link->addresses_configured);
1037         assert(link->address_messages == 0);
1038         assert(link->state != _LINK_STATE_INVALID);
1039
1040         link->static_routes_configured = false;
1041         link->static_routes_ready = false;
1042
1043         if (!link_has_carrier(link) && !link->network->configure_without_carrier)
1044                 /* During configuring addresses, the link lost its carrier. As networkd is dropping
1045                  * the addresses now, let's not configure the routes either. */
1046                 return 0;
1047
1048         r = link_request_set_routing_policy_rule(link);
1049         if (r < 0)
1050                 return r;
1051
1052         /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
1053         for (phase = 0; phase < _PHASE_MAX; phase++)
1054                 LIST_FOREACH(routes, rt, link->network->static_routes) {
1055                         if (rt->gateway_from_dhcp)
1056                                 continue;
1057
1058                         if ((in_addr_is_null(rt->family, &rt->gw) && ordered_set_isempty(rt->multipath_routes)) != (phase == PHASE_NON_GATEWAY))
1059                                 continue;
1060
1061                         r = route_configure(rt, link, route_handler);
1062                         if (r < 0)
1063                                 return log_link_warning_errno(link, r, "Could not set routes: %m");
1064                         if (r > 0)
1065                                 link->route_messages++;
1066                 }
1067
1068         if (link->route_messages == 0) {
1069                 link->static_routes_configured = true;
1070                 link_check_ready(link);
1071         } else {
1072                 log_link_debug(link, "Setting routes");
1073                 link_set_state(link, LINK_STATE_CONFIGURING);
1074         }
1075
1076         return 0;
1077 }
1078
1079 void link_check_ready(Link *link) {
1080         Address *a;
1081         Iterator i;
1082         int r;
1083
1084         assert(link);
1085
1086         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1087                 return;
1088
1089         if (!link->network)
1090                 return;
1091
1092         if (!link->addresses_configured)
1093                 return;
1094
1095         if (!link->neighbors_configured)
1096                 return;
1097
1098         SET_FOREACH(a, link->addresses, i)
1099                 if (!address_is_ready(a))
1100                         return;
1101
1102         if (!link->addresses_ready) {
1103                 link->addresses_ready = true;
1104                 r = link_request_set_routes(link);
1105                 if (r < 0)
1106                         link_enter_failed(link);
1107                 return;
1108         }
1109
1110         if (!link->static_routes_configured)
1111                 return;
1112
1113         if (!link->static_routes_ready) {
1114                 link->static_routes_ready = true;
1115                 r = link_request_set_nexthop(link);
1116                 if (r < 0)
1117                         link_enter_failed(link);
1118                 return;
1119         }
1120
1121         if (!link->static_nexthops_configured)
1122                 return;
1123
1124         if (!link->routing_policy_rules_configured)
1125                 return;
1126
1127         if (!link->tc_configured)
1128                 return;
1129
1130         if (link_has_carrier(link) || !link->network->configure_without_carrier) {
1131
1132                 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !link->ipv4ll_address)
1133                         return;
1134
1135                 if (link_ipv6ll_enabled(link) &&
1136                     in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
1137                         return;
1138
1139                 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link)) &&
1140                     !link->dhcp4_configured &&
1141                     !link->dhcp6_configured &&
1142                     !link->ndisc_configured &&
1143                     !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address))
1144                         /* When DHCP or RA is enabled, at least one protocol must provide an address, or
1145                          * an IPv4ll fallback address must be configured. */
1146                         return;
1147         }
1148
1149         if (link->state != LINK_STATE_CONFIGURED)
1150                 link_enter_configured(link);
1151
1152         return;
1153 }
1154
1155 static int link_request_set_neighbors(Link *link) {
1156         Neighbor *neighbor;
1157         int r;
1158
1159         assert(link);
1160         assert(link->network);
1161         assert(link->state != _LINK_STATE_INVALID);
1162
1163         link->neighbors_configured = false;
1164
1165         LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1166                 r = neighbor_configure(neighbor, link, NULL);
1167                 if (r < 0)
1168                         return log_link_warning_errno(link, r, "Could not set neighbor: %m");
1169         }
1170
1171         if (link->neighbor_messages == 0) {
1172                 link->neighbors_configured = true;
1173                 link_check_ready(link);
1174         } else {
1175                 log_link_debug(link, "Setting neighbors");
1176                 link_set_state(link, LINK_STATE_CONFIGURING);
1177         }
1178
1179         return 0;
1180 }
1181
1182 int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1183         int r;
1184
1185         assert(rtnl);
1186         assert(m);
1187         assert(link);
1188         assert(link->ifname);
1189         assert(link->address_messages > 0);
1190         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1191                LINK_STATE_FAILED, LINK_STATE_LINGER));
1192
1193         link->address_messages--;
1194
1195         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1196                 return 1;
1197
1198         r = sd_netlink_message_get_errno(m);
1199         if (r < 0 && r != -EEXIST) {
1200                 log_link_message_warning_errno(link, m, r, "Could not set address");
1201                 link_enter_failed(link);
1202                 return 1;
1203         } else if (r >= 0)
1204                 (void) manager_rtnl_process_address(rtnl, m, link->manager);
1205
1206         if (link->address_messages == 0) {
1207                 log_link_debug(link, "Addresses set");
1208                 link->addresses_configured = true;
1209                 link_check_ready(link);
1210         }
1211
1212         return 1;
1213 }
1214
1215 static int link_set_bridge_fdb(Link *link) {
1216         FdbEntry *fdb_entry;
1217         int r;
1218
1219         LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1220                 r = fdb_entry_configure(link, fdb_entry);
1221                 if (r < 0)
1222                         return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1223         }
1224
1225         return 0;
1226 }
1227
1228 static int link_request_set_addresses(Link *link) {
1229         AddressLabel *label;
1230         Address *ad;
1231         Prefix *p;
1232         int r;
1233
1234         assert(link);
1235         assert(link->network);
1236         assert(link->state != _LINK_STATE_INVALID);
1237
1238         /* Reset all *_configured flags we are configuring. */
1239         link->addresses_configured = false;
1240         link->addresses_ready = false;
1241         link->neighbors_configured = false;
1242         link->static_routes_configured = false;
1243         link->static_routes_ready = false;
1244         link->static_nexthops_configured = false;
1245         link->routing_policy_rules_configured = false;
1246
1247         r = link_set_bridge_fdb(link);
1248         if (r < 0)
1249                 return r;
1250
1251         r = link_request_set_neighbors(link);
1252         if (r < 0)
1253                 return r;
1254
1255         LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1256                 bool update;
1257
1258                 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1259
1260                 r = address_configure(ad, link, address_handler, update);
1261                 if (r < 0)
1262                         return log_link_warning_errno(link, r, "Could not set addresses: %m");
1263                 if (r > 0)
1264                         link->address_messages++;
1265         }
1266
1267         if (IN_SET(link->network->router_prefix_delegation,
1268                    RADV_PREFIX_DELEGATION_STATIC,
1269                    RADV_PREFIX_DELEGATION_BOTH))
1270                 LIST_FOREACH(prefixes, p, link->network->static_prefixes) {
1271                         _cleanup_(address_freep) Address *address = NULL;
1272
1273                         if (!p->assign)
1274                                 continue;
1275
1276                         r = address_new(&address);
1277                         if (r < 0)
1278                                 return log_link_error_errno(link, r, "Could not allocate address: %m");
1279
1280                         r = sd_radv_prefix_get_prefix(p->radv_prefix, &address->in_addr.in6, &address->prefixlen);
1281                         if (r < 0)
1282                                 return r;
1283
1284                         r = generate_ipv6_eui_64_address(link, &address->in_addr.in6);
1285                         if (r < 0)
1286                                 return r;
1287
1288                         address->family = AF_INET6;
1289                         r = address_configure(address, link, address_handler, true);
1290                         if (r < 0)
1291                                 return log_link_warning_errno(link, r, "Could not set addresses: %m");
1292                         if (r > 0)
1293                                 link->address_messages++;
1294                 }
1295
1296         LIST_FOREACH(labels, label, link->network->address_labels) {
1297                 r = address_label_configure(label, link, NULL, false);
1298                 if (r < 0)
1299                         return log_link_warning_errno(link, r, "Could not set address label: %m");
1300
1301                 link->address_label_messages++;
1302         }
1303
1304         /* now that we can figure out a default address for the dhcp server,
1305            start it */
1306         if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1307                 r = dhcp4_server_configure(link);
1308                 if (r < 0)
1309                         return r;
1310                 log_link_debug(link, "Offering DHCPv4 leases");
1311         }
1312
1313         if (link->address_messages == 0) {
1314                 link->addresses_configured = true;
1315                 link_check_ready(link);
1316         } else {
1317                 log_link_debug(link, "Setting addresses");
1318                 link_set_state(link, LINK_STATE_CONFIGURING);
1319         }
1320
1321         return 0;
1322 }
1323
1324 static int link_set_bridge_vlan(Link *link) {
1325         int r;
1326
1327         r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1328         if (r < 0)
1329                 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1330
1331         return r;
1332 }
1333
1334 static int link_set_proxy_arp(Link *link) {
1335         int r;
1336
1337         if (!link_proxy_arp_enabled(link))
1338                 return 0;
1339
1340         r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1341         if (r < 0)
1342                 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1343
1344         return 0;
1345 }
1346
1347 static int link_configure_continue(Link *link);
1348
1349 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1350         int r;
1351
1352         assert(m);
1353         assert(link);
1354         assert(link->ifname);
1355
1356         link->setting_mtu = false;
1357
1358         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1359                 return 1;
1360
1361         r = sd_netlink_message_get_errno(m);
1362         if (r < 0)
1363                 log_link_message_warning_errno(link, m, r, "Could not set MTU, ignoring");
1364         else
1365                 log_link_debug(link, "Setting MTU done.");
1366
1367         if (link->state == LINK_STATE_INITIALIZED) {
1368                 r = link_configure_continue(link);
1369                 if (r < 0)
1370                         link_enter_failed(link);
1371         }
1372
1373         return 1;
1374 }
1375
1376 int link_set_mtu(Link *link, uint32_t mtu) {
1377         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1378         int r;
1379
1380         assert(link);
1381         assert(link->manager);
1382         assert(link->manager->rtnl);
1383
1384         if (mtu == 0 || link->setting_mtu)
1385                 return 0;
1386
1387         if (link->mtu == mtu)
1388                 return 0;
1389
1390         log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1391
1392         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1393         if (r < 0)
1394                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1395
1396         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1397          * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1398         if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1399
1400                 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1401                                  "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes");
1402
1403                 mtu = IPV6_MIN_MTU;
1404         }
1405
1406         r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1407         if (r < 0)
1408                 return log_link_error_errno(link, r, "Could not append MTU: %m");
1409
1410         r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1411                                link_netlink_destroy_callback, link);
1412         if (r < 0)
1413                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1414
1415         link_ref(link);
1416         link->setting_mtu = true;
1417
1418         return 0;
1419 }
1420
1421 static bool link_reduces_vlan_mtu(Link *link) {
1422         /* See netif_reduces_vlan_mtu() in kernel. */
1423         return streq_ptr(link->kind, "macsec");
1424 }
1425
1426 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1427         uint32_t mtu = 0;
1428         NetDev *dev;
1429         Iterator i;
1430
1431         HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1432                 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1433                         /* See vlan_dev_change_mtu() in kernel. */
1434                         mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1435
1436                 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1437                         /* See macvlan_change_mtu() in kernel. */
1438                         mtu = dev->mtu;
1439
1440         return mtu;
1441 }
1442
1443 static int link_configure_mtu(Link *link) {
1444         uint32_t mtu;
1445
1446         assert(link);
1447         assert(link->network);
1448
1449         if (link->network->mtu > 0)
1450                 return link_set_mtu(link, link->network->mtu);
1451
1452         mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1453         if (link->mtu >= mtu)
1454                 return 0;
1455
1456         log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1457                         "If it is not desired, then please explicitly specify MTUBytes= setting.",
1458                         link->mtu, mtu);
1459
1460         return link_set_mtu(link, mtu);
1461 }
1462
1463 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1464         int r;
1465
1466         assert(m);
1467         assert(link);
1468         assert(link->ifname);
1469
1470         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1471                 return 1;
1472
1473         r = sd_netlink_message_get_errno(m);
1474         if (r < 0)
1475                 log_link_message_warning_errno(link, m, r, "Could not set link flags, ignoring");
1476
1477         return 1;
1478 }
1479
1480 static int link_set_flags(Link *link) {
1481         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1482         unsigned ifi_change = 0;
1483         unsigned ifi_flags = 0;
1484         int r;
1485
1486         assert(link);
1487         assert(link->manager);
1488         assert(link->manager->rtnl);
1489
1490         if (link->flags & IFF_LOOPBACK)
1491                 return 0;
1492
1493         if (!link->network)
1494                 return 0;
1495
1496         if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1497                 return 0;
1498
1499         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1500         if (r < 0)
1501                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1502
1503         if (link->network->arp >= 0) {
1504                 ifi_change |= IFF_NOARP;
1505                 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1506         }
1507
1508         if (link->network->multicast >= 0) {
1509                 ifi_change |= IFF_MULTICAST;
1510                 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1511         }
1512
1513         if (link->network->allmulticast >= 0) {
1514                 ifi_change |= IFF_ALLMULTI;
1515                 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1516         }
1517
1518         r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1519         if (r < 0)
1520                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1521
1522         r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1523                                link_netlink_destroy_callback, link);
1524         if (r < 0)
1525                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1526
1527         link_ref(link);
1528
1529         return 0;
1530 }
1531
1532 static int link_acquire_ipv6_conf(Link *link) {
1533         int r;
1534
1535         assert(link);
1536
1537         if (link_ipv6_accept_ra_enabled(link)) {
1538                 assert(link->ndisc);
1539
1540                 log_link_debug(link, "Discovering IPv6 routers");
1541
1542                 r = sd_ndisc_start(link->ndisc);
1543                 if (r < 0 && r != -EBUSY)
1544                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1545         }
1546
1547         if (link_radv_enabled(link)) {
1548                 assert(link->radv);
1549                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1550
1551                 log_link_debug(link, "Starting IPv6 Router Advertisements");
1552
1553                 r = radv_emit_dns(link);
1554                 if (r < 0)
1555                         return log_link_warning_errno(link, r, "Failed to configure DNS or Domains in IPv6 Router Advertisement: %m");
1556
1557                 r = sd_radv_start(link->radv);
1558                 if (r < 0 && r != -EBUSY)
1559                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1560         }
1561
1562         if (link_dhcp6_enabled(link) && link->network->dhcp6_without_ra) {
1563                 assert(link->dhcp6_client);
1564                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1565
1566                 r = dhcp6_request_address(link, true);
1567                 if (r < 0 && r != -EBUSY)
1568                         return log_link_warning_errno(link, r,  "Could not acquire DHCPv6 lease: %m");
1569                 else
1570                         log_link_debug(link, "Acquiring DHCPv6 lease");
1571         }
1572
1573         (void) dhcp6_request_prefix_delegation(link);
1574
1575         return 0;
1576 }
1577
1578 static int link_acquire_ipv4_conf(Link *link) {
1579         int r;
1580
1581         assert(link);
1582         assert(link->manager);
1583         assert(link->manager->event);
1584
1585         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1586                 assert(link->ipv4ll);
1587
1588                 log_link_debug(link, "Acquiring IPv4 link-local address");
1589
1590                 r = sd_ipv4ll_start(link->ipv4ll);
1591                 if (r < 0)
1592                         return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1593         }
1594
1595         if (link_dhcp4_enabled(link)) {
1596                 assert(link->dhcp_client);
1597
1598                 log_link_debug(link, "Acquiring DHCPv4 lease");
1599
1600                 r = sd_dhcp_client_start(link->dhcp_client);
1601                 if (r < 0)
1602                         return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1603         }
1604
1605         return 0;
1606 }
1607
1608 static int link_acquire_conf(Link *link) {
1609         int r;
1610
1611         assert(link);
1612
1613         r = link_acquire_ipv4_conf(link);
1614         if (r < 0)
1615                 return r;
1616
1617         if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1618                 r = link_acquire_ipv6_conf(link);
1619                 if (r < 0)
1620                         return r;
1621         }
1622
1623         if (link_lldp_emit_enabled(link)) {
1624                 r = link_lldp_emit_start(link);
1625                 if (r < 0)
1626                         return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1627         }
1628
1629         return 0;
1630 }
1631
1632 bool link_has_carrier(Link *link) {
1633         /* see Documentation/networking/operstates.txt in the kernel sources */
1634
1635         if (link->kernel_operstate == IF_OPER_UP)
1636                 return true;
1637
1638         if (link->kernel_operstate == IF_OPER_UNKNOWN)
1639                 /* operstate may not be implemented, so fall back to flags */
1640                 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1641                     !FLAGS_SET(link->flags, IFF_DORMANT))
1642                         return true;
1643
1644         return false;
1645 }
1646
1647 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1648         int r;
1649
1650         assert(link);
1651
1652         link->setting_genmode = false;
1653
1654         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1655                 return 1;
1656
1657         r = sd_netlink_message_get_errno(m);
1658         if (r < 0)
1659                 log_link_message_warning_errno(link, m, r, "Could not set address genmode for interface, ignoring");
1660         else
1661                 log_link_debug(link, "Setting address genmode done.");
1662
1663         if (link->state == LINK_STATE_INITIALIZED) {
1664                 r = link_configure_continue(link);
1665                 if (r < 0)
1666                         link_enter_failed(link);
1667         }
1668
1669         return 1;
1670 }
1671
1672 static int link_configure_addrgen_mode(Link *link) {
1673         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1674         uint8_t ipv6ll_mode;
1675         int r;
1676
1677         assert(link);
1678         assert(link->network);
1679         assert(link->manager);
1680         assert(link->manager->rtnl);
1681
1682         if (!socket_ipv6_is_supported() || link->setting_genmode)
1683                 return 0;
1684
1685         log_link_debug(link, "Setting address genmode for link");
1686
1687         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1688         if (r < 0)
1689                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1690
1691         r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1692         if (r < 0)
1693                 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1694
1695         r = sd_netlink_message_open_container(req, AF_INET6);
1696         if (r < 0)
1697                 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1698
1699         if (!link_ipv6ll_enabled(link))
1700                 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1701         else if (link->network->ipv6ll_address_gen_mode < 0) {
1702                 r = sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL);
1703                 if (r < 0) {
1704                         /* The file may not exist. And even if it exists, when stable_secret is unset,
1705                          * reading the file fails with EIO. */
1706                         log_link_debug_errno(link, r, "Failed to read sysctl property stable_secret: %m");
1707
1708                         ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1709                 } else
1710                         ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1711         } else
1712                 ipv6ll_mode = link->network->ipv6ll_address_gen_mode;
1713
1714         r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1715         if (r < 0)
1716                 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1717
1718         r = sd_netlink_message_close_container(req);
1719         if (r < 0)
1720                 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1721
1722         r = sd_netlink_message_close_container(req);
1723         if (r < 0)
1724                 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1725
1726         r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1727                                link_netlink_destroy_callback, link);
1728         if (r < 0)
1729                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1730
1731         link_ref(link);
1732         link->setting_genmode = true;
1733
1734         return 0;
1735 }
1736
1737 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1738         int r;
1739
1740         assert(link);
1741
1742         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1743                 return 1;
1744
1745         r = sd_netlink_message_get_errno(m);
1746         if (r < 0)
1747                 /* we warn but don't fail the link, as it may be brought up later */
1748                 log_link_message_warning_errno(link, m, r, "Could not bring up interface");
1749
1750         return 1;
1751 }
1752
1753 static int link_up(Link *link) {
1754         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1755         int r;
1756
1757         assert(link);
1758         assert(link->network);
1759         assert(link->manager);
1760         assert(link->manager->rtnl);
1761
1762         log_link_debug(link, "Bringing link up");
1763
1764         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1765         if (r < 0)
1766                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1767
1768         /* set it free if not enslaved with networkd */
1769         if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1770                 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1771                 if (r < 0)
1772                         return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1773         }
1774
1775         r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1776         if (r < 0)
1777                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1778
1779         if (link->network->mac) {
1780                 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1781                 if (r < 0)
1782                         return log_link_error_errno(link, r, "Could not set MAC address: %m");
1783         }
1784
1785         r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1786                                link_netlink_destroy_callback, link);
1787         if (r < 0)
1788                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1789
1790         link_ref(link);
1791
1792         return 0;
1793 }
1794
1795 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1796         int r;
1797
1798         assert(link);
1799
1800         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1801                 return 1;
1802
1803         r = sd_netlink_message_get_errno(m);
1804         if (r < 0)
1805                 log_link_message_warning_errno(link, m, r, "Could not bring down interface");
1806
1807         return 1;
1808 }
1809
1810 int link_down(Link *link, link_netlink_message_handler_t callback) {
1811         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1812         int r;
1813
1814         assert(link);
1815         assert(link->manager);
1816         assert(link->manager->rtnl);
1817
1818         log_link_debug(link, "Bringing link down");
1819
1820         r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1821                                      RTM_SETLINK, link->ifindex);
1822         if (r < 0)
1823                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1824
1825         r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1826         if (r < 0)
1827                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1828
1829         r = netlink_call_async(link->manager->rtnl, NULL, req,
1830                                callback ?: link_down_handler,
1831                                link_netlink_destroy_callback, link);
1832         if (r < 0)
1833                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1834
1835         link_ref(link);
1836
1837         return 0;
1838 }
1839
1840 static int link_group_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1841         int r;
1842
1843         assert(link);
1844
1845         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1846                 return 1;
1847
1848         r = sd_netlink_message_get_errno(m);
1849         if (r < 0)
1850                 log_link_message_warning_errno(link, m, r, "Could not set group for the interface");
1851
1852         return 1;
1853 }
1854
1855 static int link_set_group(Link *link) {
1856         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1857         int r;
1858
1859         assert(link);
1860         assert(link->network);
1861         assert(link->manager);
1862         assert(link->manager->rtnl);
1863
1864         if (link->network->group <= 0)
1865                 return 0;
1866
1867         log_link_debug(link, "Setting group");
1868
1869         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1870         if (r < 0)
1871                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1872
1873         r = sd_netlink_message_append_u32(req, IFLA_GROUP, link->network->group);
1874         if (r < 0)
1875                 return log_link_error_errno(link, r, "Could not set link group: %m");
1876
1877         r = netlink_call_async(link->manager->rtnl, NULL, req, link_group_handler,
1878                                link_netlink_destroy_callback, link);
1879         if (r < 0)
1880                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1881
1882         link_ref(link);
1883
1884         return 0;
1885 }
1886
1887 static int link_handle_bound_to_list(Link *link) {
1888         Link *l;
1889         Iterator i;
1890         int r;
1891         bool required_up = false;
1892         bool link_is_up = false;
1893
1894         assert(link);
1895
1896         if (hashmap_isempty(link->bound_to_links))
1897                 return 0;
1898
1899         if (link->flags & IFF_UP)
1900                 link_is_up = true;
1901
1902         HASHMAP_FOREACH (l, link->bound_to_links, i)
1903                 if (link_has_carrier(l)) {
1904                         required_up = true;
1905                         break;
1906                 }
1907
1908         if (!required_up && link_is_up) {
1909                 r = link_down(link, NULL);
1910                 if (r < 0)
1911                         return r;
1912         } else if (required_up && !link_is_up) {
1913                 r = link_up(link);
1914                 if (r < 0)
1915                         return r;
1916         }
1917
1918         return 0;
1919 }
1920
1921 static int link_handle_bound_by_list(Link *link) {
1922         Iterator i;
1923         Link *l;
1924         int r;
1925
1926         assert(link);
1927
1928         if (hashmap_isempty(link->bound_by_links))
1929                 return 0;
1930
1931         HASHMAP_FOREACH (l, link->bound_by_links, i) {
1932                 r = link_handle_bound_to_list(l);
1933                 if (r < 0)
1934                         return r;
1935         }
1936
1937         return 0;
1938 }
1939
1940 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1941         int r;
1942
1943         assert(link);
1944         assert(carrier);
1945
1946         if (link == carrier)
1947                 return 0;
1948
1949         if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1950                 return 0;
1951
1952         r = hashmap_ensure_allocated(h, NULL);
1953         if (r < 0)
1954                 return r;
1955
1956         r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1957         if (r < 0)
1958                 return r;
1959
1960         return 0;
1961 }
1962
1963 static int link_new_bound_by_list(Link *link) {
1964         Manager *m;
1965         Link *carrier;
1966         Iterator i;
1967         int r;
1968         bool list_updated = false;
1969
1970         assert(link);
1971         assert(link->manager);
1972
1973         m = link->manager;
1974
1975         HASHMAP_FOREACH(carrier, m->links, i) {
1976                 if (!carrier->network)
1977                         continue;
1978
1979                 if (strv_isempty(carrier->network->bind_carrier))
1980                         continue;
1981
1982                 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
1983                         r = link_put_carrier(link, carrier, &link->bound_by_links);
1984                         if (r < 0)
1985                                 return r;
1986
1987                         list_updated = true;
1988                 }
1989         }
1990
1991         if (list_updated)
1992                 link_dirty(link);
1993
1994         HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
1995                 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
1996                 if (r < 0)
1997                         return r;
1998
1999                 link_dirty(carrier);
2000         }
2001
2002         return 0;
2003 }
2004
2005 static int link_new_bound_to_list(Link *link) {
2006         Manager *m;
2007         Link *carrier;
2008         Iterator i;
2009         int r;
2010         bool list_updated = false;
2011
2012         assert(link);
2013         assert(link->manager);
2014
2015         if (!link->network)
2016                 return 0;
2017
2018         if (strv_isempty(link->network->bind_carrier))
2019                 return 0;
2020
2021         m = link->manager;
2022
2023         HASHMAP_FOREACH (carrier, m->links, i) {
2024                 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
2025                         r = link_put_carrier(link, carrier, &link->bound_to_links);
2026                         if (r < 0)
2027                                 return r;
2028
2029                         list_updated = true;
2030                 }
2031         }
2032
2033         if (list_updated)
2034                 link_dirty(link);
2035
2036         HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2037                 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2038                 if (r < 0)
2039                         return r;
2040
2041                 link_dirty(carrier);
2042         }
2043
2044         return 0;
2045 }
2046
2047 static int link_new_carrier_maps(Link *link) {
2048         int r;
2049
2050         r = link_new_bound_by_list(link);
2051         if (r < 0)
2052                 return r;
2053
2054         r = link_handle_bound_by_list(link);
2055         if (r < 0)
2056                 return r;
2057
2058         r = link_new_bound_to_list(link);
2059         if (r < 0)
2060                 return r;
2061
2062         r = link_handle_bound_to_list(link);
2063         if (r < 0)
2064                 return r;
2065
2066         return 0;
2067 }
2068
2069 static void link_free_bound_to_list(Link *link) {
2070         Link *bound_to;
2071         Iterator i;
2072
2073         HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2074                 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2075
2076                 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2077                         link_dirty(bound_to);
2078         }
2079
2080         return;
2081 }
2082
2083 static void link_free_bound_by_list(Link *link) {
2084         Link *bound_by;
2085         Iterator i;
2086
2087         HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2088                 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2089
2090                 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2091                         link_dirty(bound_by);
2092                         link_handle_bound_to_list(bound_by);
2093                 }
2094         }
2095
2096         return;
2097 }
2098
2099 static void link_free_carrier_maps(Link *link) {
2100         bool list_updated = false;
2101
2102         assert(link);
2103
2104         if (!hashmap_isempty(link->bound_to_links)) {
2105                 link_free_bound_to_list(link);
2106                 list_updated = true;
2107         }
2108
2109         if (!hashmap_isempty(link->bound_by_links)) {
2110                 link_free_bound_by_list(link);
2111                 list_updated = true;
2112         }
2113
2114         if (list_updated)
2115                 link_dirty(link);
2116
2117         return;
2118 }
2119
2120 static int link_append_to_master(Link *link, NetDev *netdev) {
2121         Link *master;
2122         int r;
2123
2124         assert(link);
2125         assert(netdev);
2126
2127         r = link_get(link->manager, netdev->ifindex, &master);
2128         if (r < 0)
2129                 return r;
2130
2131         r = set_ensure_put(&master->slaves, NULL, link);
2132         if (r <= 0)
2133                 return r;
2134
2135         link_ref(link);
2136         return 0;
2137 }
2138
2139 static void link_drop_from_master(Link *link, NetDev *netdev) {
2140         Link *master;
2141
2142         assert(link);
2143
2144         if (!link->manager || !netdev)
2145                 return;
2146
2147         if (link_get(link->manager, netdev->ifindex, &master) < 0)
2148                 return;
2149
2150         link_unref(set_remove(master->slaves, link));
2151 }
2152
2153 static void link_detach_from_manager(Link *link) {
2154         if (!link || !link->manager)
2155                 return;
2156
2157         link_unref(set_remove(link->manager->links_requesting_uuid, link));
2158         link_clean(link);
2159
2160         /* The following must be called at last. */
2161         assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2162         link_unref(link);
2163 }
2164
2165 void link_drop(Link *link) {
2166         if (!link || link->state == LINK_STATE_LINGER)
2167                 return;
2168
2169         link_set_state(link, LINK_STATE_LINGER);
2170
2171         link_free_carrier_maps(link);
2172
2173         if (link->network) {
2174                 link_drop_from_master(link, link->network->bridge);
2175                 link_drop_from_master(link, link->network->bond);
2176         }
2177
2178         log_link_debug(link, "Link removed");
2179
2180         (void) unlink(link->state_file);
2181         link_detach_from_manager(link);
2182 }
2183
2184 static int link_joined(Link *link) {
2185         int r;
2186
2187         assert(link);
2188         assert(link->network);
2189
2190         if (!hashmap_isempty(link->bound_to_links)) {
2191                 r = link_handle_bound_to_list(link);
2192                 if (r < 0)
2193                         return r;
2194         } else if (!(link->flags & IFF_UP)) {
2195                 r = link_up(link);
2196                 if (r < 0) {
2197                         link_enter_failed(link);
2198                         return r;
2199                 }
2200         }
2201
2202         if (link->network->bridge) {
2203                 r = link_set_bridge(link);
2204                 if (r < 0)
2205                         log_link_error_errno(link, r, "Could not set bridge message: %m");
2206
2207                 r = link_append_to_master(link, link->network->bridge);
2208                 if (r < 0)
2209                         log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2210         }
2211
2212         if (link->network->bond) {
2213                 r = link_set_bond(link);
2214                 if (r < 0)
2215                         log_link_error_errno(link, r, "Could not set bond message: %m");
2216
2217                 r = link_append_to_master(link, link->network->bond);
2218                 if (r < 0)
2219                         log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2220         }
2221
2222         if (link->network->use_br_vlan &&
2223             (link->network->bridge || streq_ptr("bridge", link->kind))) {
2224                 r = link_set_bridge_vlan(link);
2225                 if (r < 0)
2226                         log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2227         }
2228
2229         /* Skip setting up addresses until it gets carrier,
2230            or it would try to set addresses twice,
2231            which is bad for non-idempotent steps. */
2232         if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2233                 return 0;
2234
2235         link_set_state(link, LINK_STATE_CONFIGURING);
2236         return link_request_set_addresses(link);
2237 }
2238
2239 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2240         int r;
2241
2242         assert(link);
2243         assert(link->network);
2244         assert(link->enslaving > 0);
2245
2246         link->enslaving--;
2247
2248         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2249                 return 1;
2250
2251         r = sd_netlink_message_get_errno(m);
2252         if (r < 0 && r != -EEXIST) {
2253                 log_link_message_warning_errno(link, m, r, "Could not join netdev");
2254                 link_enter_failed(link);
2255                 return 1;
2256         }
2257
2258         log_link_debug(link, "Joined netdev");
2259
2260         if (link->enslaving == 0) {
2261                 r = link_joined(link);
2262                 if (r < 0)
2263                         link_enter_failed(link);
2264         }
2265
2266         return 1;
2267 }
2268
2269 static int link_enter_join_netdev(Link *link) {
2270         NetDev *netdev;
2271         Iterator i;
2272         int r;
2273
2274         assert(link);
2275         assert(link->network);
2276         assert(link->state == LINK_STATE_INITIALIZED);
2277
2278         link_set_state(link, LINK_STATE_CONFIGURING);
2279
2280         link_dirty(link);
2281         link->enslaving = 0;
2282
2283         if (link->network->bond) {
2284                 if (link->network->bond->state == NETDEV_STATE_READY &&
2285                     link->network->bond->ifindex == link->master_ifindex)
2286                         return link_joined(link);
2287
2288                 log_struct(LOG_DEBUG,
2289                            LOG_LINK_INTERFACE(link),
2290                            LOG_NETDEV_INTERFACE(link->network->bond),
2291                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2292
2293                 link->enslaving++;
2294
2295                 r = netdev_join(link->network->bond, link, netdev_join_handler);
2296                 if (r < 0) {
2297                         log_struct_errno(LOG_WARNING, r,
2298                                          LOG_LINK_INTERFACE(link),
2299                                          LOG_NETDEV_INTERFACE(link->network->bond),
2300                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2301                         link_enter_failed(link);
2302                         return r;
2303                 }
2304         }
2305
2306         if (link->network->bridge) {
2307                 log_struct(LOG_DEBUG,
2308                            LOG_LINK_INTERFACE(link),
2309                            LOG_NETDEV_INTERFACE(link->network->bridge),
2310                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2311
2312                 link->enslaving++;
2313
2314                 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2315                 if (r < 0) {
2316                         log_struct_errno(LOG_WARNING, r,
2317                                          LOG_LINK_INTERFACE(link),
2318                                          LOG_NETDEV_INTERFACE(link->network->bridge),
2319                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2320                         link_enter_failed(link);
2321                         return r;
2322                 }
2323         }
2324
2325         if (link->network->vrf) {
2326                 log_struct(LOG_DEBUG,
2327                            LOG_LINK_INTERFACE(link),
2328                            LOG_NETDEV_INTERFACE(link->network->vrf),
2329                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2330
2331                 link->enslaving++;
2332
2333                 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2334                 if (r < 0) {
2335                         log_struct_errno(LOG_WARNING, r,
2336                                          LOG_LINK_INTERFACE(link),
2337                                          LOG_NETDEV_INTERFACE(link->network->vrf),
2338                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2339                         link_enter_failed(link);
2340                         return r;
2341                 }
2342         }
2343
2344         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2345
2346                 if (netdev->ifindex > 0)
2347                         /* Assume already enslaved. */
2348                         continue;
2349
2350                 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2351                         continue;
2352
2353                 log_struct(LOG_DEBUG,
2354                            LOG_LINK_INTERFACE(link),
2355                            LOG_NETDEV_INTERFACE(netdev),
2356                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2357
2358                 link->enslaving++;
2359
2360                 r = netdev_join(netdev, link, netdev_join_handler);
2361                 if (r < 0) {
2362                         log_struct_errno(LOG_WARNING, r,
2363                                          LOG_LINK_INTERFACE(link),
2364                                          LOG_NETDEV_INTERFACE(netdev),
2365                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2366                         link_enter_failed(link);
2367                         return r;
2368                 }
2369         }
2370
2371         if (link->enslaving == 0)
2372                 return link_joined(link);
2373
2374         return 0;
2375 }
2376
2377 static int link_set_ipv4_forward(Link *link) {
2378         int r;
2379
2380         if (!link_ipv4_forward_enabled(link))
2381                 return 0;
2382
2383         /* We propagate the forwarding flag from one interface to the
2384          * global setting one way. This means: as long as at least one
2385          * interface was configured at any time that had IP forwarding
2386          * enabled the setting will stay on for good. We do this
2387          * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2388          * somewhat in sync (see below). */
2389
2390         r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2391         if (r < 0)
2392                 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2393
2394         return 0;
2395 }
2396
2397 static int link_set_ipv6_forward(Link *link) {
2398         int r;
2399
2400         if (!link_ipv6_forward_enabled(link))
2401                 return 0;
2402
2403         /* On Linux, the IPv6 stack does not know a per-interface
2404          * packet forwarding setting: either packet forwarding is on
2405          * for all, or off for all. We hence don't bother with a
2406          * per-interface setting, but simply propagate the interface
2407          * flag, if it is set, to the global flag, one-way. Note that
2408          * while IPv4 would allow a per-interface flag, we expose the
2409          * same behaviour there and also propagate the setting from
2410          * one to all, to keep things simple (see above). */
2411
2412         r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2413         if (r < 0)
2414                 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2415
2416         return 0;
2417 }
2418
2419 static int link_set_ipv6_privacy_extensions(Link *link) {
2420         IPv6PrivacyExtensions s;
2421         int r;
2422
2423         s = link_ipv6_privacy_extensions(link);
2424         if (s < 0)
2425                 return 0;
2426
2427         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2428         if (r < 0)
2429                 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2430
2431         return 0;
2432 }
2433
2434 static int link_set_ipv6_accept_ra(Link *link) {
2435         int r;
2436
2437         /* Make this a NOP if IPv6 is not available */
2438         if (!socket_ipv6_is_supported())
2439                 return 0;
2440
2441         if (link->flags & IFF_LOOPBACK)
2442                 return 0;
2443
2444         if (!link->network)
2445                 return 0;
2446
2447         r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2448         if (r < 0)
2449                 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2450
2451         return 0;
2452 }
2453
2454 static int link_set_ipv6_dad_transmits(Link *link) {
2455         int r;
2456
2457         /* Make this a NOP if IPv6 is not available */
2458         if (!socket_ipv6_is_supported())
2459                 return 0;
2460
2461         if (link->flags & IFF_LOOPBACK)
2462                 return 0;
2463
2464         if (!link->network)
2465                 return 0;
2466
2467         if (link->network->ipv6_dad_transmits < 0)
2468                 return 0;
2469
2470         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2471         if (r < 0)
2472                 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2473
2474         return 0;
2475 }
2476
2477 static int link_set_ipv6_hop_limit(Link *link) {
2478         int r;
2479
2480         /* Make this a NOP if IPv6 is not available */
2481         if (!socket_ipv6_is_supported())
2482                 return 0;
2483
2484         if (link->flags & IFF_LOOPBACK)
2485                 return 0;
2486
2487         if (!link->network)
2488                 return 0;
2489
2490         if (link->network->ipv6_hop_limit < 0)
2491                 return 0;
2492
2493         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2494         if (r < 0)
2495                 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2496
2497         return 0;
2498 }
2499
2500 static int link_set_ipv6_mtu(Link *link) {
2501         int r;
2502
2503         /* Make this a NOP if IPv6 is not available */
2504         if (!socket_ipv6_is_supported())
2505                 return 0;
2506
2507         if (link->flags & IFF_LOOPBACK)
2508                 return 0;
2509
2510         if (link->network->ipv6_mtu == 0)
2511                 return 0;
2512
2513         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
2514          * on the interface. Bump up IPv6 MTU bytes to IPV6_MTU_MIN. */
2515         if (link->network->ipv6_mtu < IPV6_MIN_MTU) {
2516                 log_link_notice(link, "Bumping IPv6 MTU to "STRINGIFY(IPV6_MIN_MTU)" byte minimum required");
2517                 link->network->ipv6_mtu = IPV6_MIN_MTU;
2518         }
2519
2520         r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2521         if (r < 0) {
2522                 if (link->mtu < link->network->ipv6_mtu)
2523                         log_link_warning(link, "Cannot set IPv6 MTU %"PRIu32" higher than device MTU %"PRIu32,
2524                                          link->network->ipv6_mtu, link->mtu);
2525                 else
2526                         log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2527         }
2528
2529         link->ipv6_mtu_set = true;
2530
2531         return 0;
2532 }
2533
2534 static int link_set_ipv4_accept_local(Link *link) {
2535         int r;
2536
2537         if (link->flags & IFF_LOOPBACK)
2538                 return 0;
2539
2540         if (link->network->ipv4_accept_local < 0)
2541                 return 0;
2542
2543         r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "accept_local", link->network->ipv4_accept_local);
2544         if (r < 0)
2545                 log_link_warning_errno(link, r, "Cannot set IPv4 accept_local flag for interface: %m");
2546
2547         return 0;
2548 }
2549
2550 static bool link_is_static_address_configured(Link *link, Address *address) {
2551         Address *net_address;
2552
2553         assert(link);
2554         assert(address);
2555
2556         if (!link->network)
2557                 return false;
2558
2559         LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2560                 if (address_equal(net_address, address))
2561                         return true;
2562
2563         return false;
2564 }
2565
2566 static bool link_is_neighbor_configured(Link *link, Neighbor *neighbor) {
2567         Neighbor *net_neighbor;
2568
2569         assert(link);
2570         assert(neighbor);
2571
2572         if (!link->network)
2573                 return false;
2574
2575         LIST_FOREACH(neighbors, net_neighbor, link->network->neighbors)
2576                 if (neighbor_equal(net_neighbor, neighbor))
2577                         return true;
2578
2579         return false;
2580 }
2581
2582 static bool link_is_static_route_configured(Link *link, Route *route) {
2583         Route *net_route;
2584
2585         assert(link);
2586         assert(route);
2587
2588         if (!link->network)
2589                 return false;
2590
2591         LIST_FOREACH(routes, net_route, link->network->static_routes)
2592                 if (route_equal(net_route, route))
2593                         return true;
2594
2595         return false;
2596 }
2597
2598 static bool link_address_is_dynamic(Link *link, Address *address) {
2599         Route *route;
2600         Iterator i;
2601
2602         assert(link);
2603         assert(address);
2604
2605         if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
2606                 return true;
2607
2608         /* Even when the address is leased from a DHCP server, networkd assign the address
2609          * without lifetime when KeepConfiguration=dhcp. So, let's check that we have
2610          * corresponding routes with RTPROT_DHCP. */
2611         SET_FOREACH(route, link->routes_foreign, i) {
2612                 if (route->protocol != RTPROT_DHCP)
2613                         continue;
2614
2615                 if (address->family != route->family)
2616                         continue;
2617
2618                 if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc))
2619                         return true;
2620         }
2621
2622         return false;
2623 }
2624
2625 static int link_enumerate_ipv6_tentative_addresses(Link *link) {
2626         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
2627         sd_netlink_message *addr;
2628         int r;
2629
2630         assert(link);
2631         assert(link->manager);
2632         assert(link->manager->rtnl);
2633
2634         r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_GETADDR, 0, AF_INET6);
2635         if (r < 0)
2636                 return r;
2637
2638         r = sd_netlink_call(link->manager->rtnl, req, 0, &reply);
2639         if (r < 0)
2640                 return r;
2641
2642         for (addr = reply; addr; addr = sd_netlink_message_next(addr)) {
2643                 unsigned char flags;
2644                 int ifindex;
2645
2646                 r = sd_rtnl_message_addr_get_ifindex(addr, &ifindex);
2647                 if (r < 0) {
2648                         log_link_warning_errno(link, r, "rtnl: invalid ifindex, ignoring: %m");
2649                         continue;
2650                 } else if (link->ifindex != ifindex)
2651                         continue;
2652
2653                 r = sd_rtnl_message_addr_get_flags(addr, &flags);
2654                 if (r < 0) {
2655                         log_link_warning_errno(link, r, "rtnl: received address message with invalid flags, ignoring: %m");
2656                         continue;
2657                 } else if (!(flags & IFA_F_TENTATIVE))
2658                         continue;
2659
2660                 log_link_debug(link, "Found tentative ipv6 link-local address");
2661                 (void) manager_rtnl_process_address(link->manager->rtnl, addr, link->manager);
2662         }
2663
2664         return 0;
2665 }
2666
2667 static int link_drop_foreign_config(Link *link) {
2668         Address *address;
2669         Neighbor *neighbor;
2670         Route *route;
2671         Iterator i;
2672         int r;
2673
2674         /* The kernel doesn't notify us about tentative addresses;
2675          * so if ipv6ll is disabled, we need to enumerate them now so we can drop them below */
2676         if (!link_ipv6ll_enabled(link)) {
2677                 r = link_enumerate_ipv6_tentative_addresses(link);
2678                 if (r < 0)
2679                         return r;
2680         }
2681
2682         SET_FOREACH(address, link->addresses_foreign, i) {
2683                 /* we consider IPv6LL addresses to be managed by the kernel */
2684                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2685                         continue;
2686
2687                 if (link_address_is_dynamic(link, address)) {
2688                         if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2689                                 continue;
2690                 } else if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2691                         continue;
2692
2693                 if (link_is_static_address_configured(link, address)) {
2694                         r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2695                         if (r < 0)
2696                                 return log_link_error_errno(link, r, "Failed to add address: %m");
2697                 } else {
2698                         r = address_remove(address, link, NULL);
2699                         if (r < 0)
2700                                 return r;
2701                 }
2702         }
2703
2704         SET_FOREACH(neighbor, link->neighbors_foreign, i) {
2705                 if (link_is_neighbor_configured(link, neighbor)) {
2706                         r = neighbor_add(link, neighbor->family, &neighbor->in_addr, &neighbor->lladdr, neighbor->lladdr_size, NULL);
2707                         if (r < 0)
2708                                 return r;
2709                 } else {
2710                         r = neighbor_remove(neighbor, link, NULL);
2711                         if (r < 0)
2712                                 return r;
2713                 }
2714         }
2715
2716         SET_FOREACH(route, link->routes_foreign, i) {
2717                 /* do not touch routes managed by the kernel */
2718                 if (route->protocol == RTPROT_KERNEL)
2719                         continue;
2720
2721                 /* do not touch multicast route added by kernel */
2722                 /* FIXME: Why the kernel adds this route with protocol RTPROT_BOOT??? We need to investigate that.
2723                  * https://tools.ietf.org/html/rfc4862#section-5.4 may explain why. */
2724                 if (route->protocol == RTPROT_BOOT &&
2725                     route->family == AF_INET6 &&
2726                     route->dst_prefixlen == 8 &&
2727                     in_addr_equal(AF_INET6, &route->dst, &(union in_addr_union) { .in6 = {{{ 0xff,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0 }}} }))
2728                         continue;
2729
2730                 if (route->protocol == RTPROT_STATIC && link->network &&
2731                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2732                         continue;
2733
2734                 if (route->protocol == RTPROT_DHCP && link->network &&
2735                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2736                         continue;
2737
2738                 if (link_is_static_route_configured(link, route)) {
2739                         r = route_add(link, route, NULL);
2740                         if (r < 0)
2741                                 return r;
2742                 } else {
2743                         r = route_remove(route, link, NULL);
2744                         if (r < 0)
2745                                 return r;
2746                 }
2747         }
2748
2749         return 0;
2750 }
2751
2752 static int link_drop_config(Link *link) {
2753         Address *address, *pool_address;
2754         Neighbor *neighbor;
2755         Route *route;
2756         Iterator i;
2757         int r;
2758
2759         SET_FOREACH(address, link->addresses, i) {
2760                 /* we consider IPv6LL addresses to be managed by the kernel */
2761                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2762                         continue;
2763
2764                 r = address_remove(address, link, NULL);
2765                 if (r < 0)
2766                         return r;
2767
2768                 /* If this address came from an address pool, clean up the pool */
2769                 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2770                         if (address_equal(address, pool_address)) {
2771                                 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2772                                 address_free(pool_address);
2773                                 break;
2774                         }
2775                 }
2776         }
2777
2778         SET_FOREACH(neighbor, link->neighbors, i) {
2779                 r = neighbor_remove(neighbor, link, NULL);
2780                 if (r < 0)
2781                         return r;
2782         }
2783
2784         SET_FOREACH(route, link->routes, i) {
2785                 /* do not touch routes managed by the kernel */
2786                 if (route->protocol == RTPROT_KERNEL)
2787                         continue;
2788
2789                 r = route_remove(route, link, NULL);
2790                 if (r < 0)
2791                         return r;
2792         }
2793
2794         ndisc_flush(link);
2795
2796         return 0;
2797 }
2798
2799 static int link_configure_ipv4_dad(Link *link) {
2800         Address *address;
2801         int r;
2802
2803         assert(link);
2804         assert(link->network);
2805
2806         LIST_FOREACH(addresses, address, link->network->static_addresses)
2807                 if (address->family == AF_INET &&
2808                     FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV4)) {
2809                         r = configure_ipv4_duplicate_address_detection(link, address);
2810                         if (r < 0)
2811                                 return log_link_error_errno(link, r, "Failed to configure IPv4ACD: %m");
2812                 }
2813
2814         return 0;
2815 }
2816
2817 static int link_configure_traffic_control(Link *link) {
2818         TrafficControl *tc;
2819         Iterator i;
2820         int r;
2821
2822         link->tc_configured = false;
2823         link->tc_messages = 0;
2824
2825         ORDERED_HASHMAP_FOREACH(tc, link->network->tc_by_section, i) {
2826                 r = traffic_control_configure(link, tc);
2827                 if (r < 0)
2828                         return r;
2829         }
2830
2831         if (link->tc_messages == 0)
2832                 link->tc_configured = true;
2833         else
2834                 log_link_debug(link, "Configuring traffic control");
2835
2836         return 0;
2837 }
2838
2839 static int link_configure(Link *link) {
2840         int r;
2841
2842         assert(link);
2843         assert(link->network);
2844         assert(link->state == LINK_STATE_INITIALIZED);
2845
2846         r = link_configure_traffic_control(link);
2847         if (r < 0)
2848                 return r;
2849
2850         if (link->iftype == ARPHRD_CAN)
2851                 return link_configure_can(link);
2852
2853         /* If IPv6 configured that is static IPv6 address and IPv6LL autoconfiguration is enabled
2854          * for this interface, then enable IPv6 */
2855         (void) link_update_ipv6_sysctl(link);
2856
2857         r = link_set_proxy_arp(link);
2858         if (r < 0)
2859                return r;
2860
2861         r = ipv6_proxy_ndp_addresses_configure(link);
2862         if (r < 0)
2863                 return r;
2864
2865         r = link_set_ipv4_forward(link);
2866         if (r < 0)
2867                 return r;
2868
2869         r = link_set_ipv6_forward(link);
2870         if (r < 0)
2871                 return r;
2872
2873         r = link_set_ipv6_privacy_extensions(link);
2874         if (r < 0)
2875                 return r;
2876
2877         r = link_set_ipv6_accept_ra(link);
2878         if (r < 0)
2879                 return r;
2880
2881         r = link_set_ipv6_dad_transmits(link);
2882         if (r < 0)
2883                 return r;
2884
2885         r = link_set_ipv6_hop_limit(link);
2886         if (r < 0)
2887                 return r;
2888
2889         r = link_set_ipv4_accept_local(link);
2890         if (r < 0)
2891                 return r;
2892
2893         r = link_set_flags(link);
2894         if (r < 0)
2895                 return r;
2896
2897         r = link_set_group(link);
2898         if (r < 0)
2899                 return r;
2900
2901         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
2902                 r = ipv4ll_configure(link);
2903                 if (r < 0)
2904                         return r;
2905         }
2906
2907         if (link_dhcp4_enabled(link)) {
2908                 r = dhcp4_set_promote_secondaries(link);
2909                 if (r < 0)
2910                         return r;
2911
2912                 r = dhcp4_configure(link);
2913                 if (r < 0)
2914                         return r;
2915         }
2916
2917         if (link_dhcp4_server_enabled(link)) {
2918                 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2919                 if (r < 0)
2920                         return r;
2921
2922                 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2923                 if (r < 0)
2924                         return r;
2925         }
2926
2927         if (link_dhcp6_enabled(link) ||
2928             link_ipv6_accept_ra_enabled(link)) {
2929                 r = dhcp6_configure(link);
2930                 if (r < 0)
2931                         return r;
2932         }
2933
2934         if (link_ipv6_accept_ra_enabled(link)) {
2935                 r = ndisc_configure(link);
2936                 if (r < 0)
2937                         return r;
2938         }
2939
2940         if (link_radv_enabled(link)) {
2941                 r = radv_configure(link);
2942                 if (r < 0)
2943                         return r;
2944         }
2945
2946         if (link_lldp_rx_enabled(link)) {
2947                 r = link_lldp_rx_configure(link);
2948                 if (r < 0)
2949                         return r;
2950         }
2951
2952         r = link_configure_mtu(link);
2953         if (r < 0)
2954                 return r;
2955
2956         r = link_configure_addrgen_mode(link);
2957         if (r < 0)
2958                 return r;
2959
2960         r = link_configure_ipv4_dad(link);
2961         if (r < 0)
2962                 return r;
2963
2964         return link_configure_continue(link);
2965 }
2966
2967 /* The configuration continues in this separate function, instead of
2968  * including this in the above link_configure() function, for two
2969  * reasons:
2970  * 1) some devices reset the link when the mtu is set, which caused
2971  *    an infinite loop here in networkd; see:
2972  *    https://github.com/systemd/systemd/issues/6593
2973  *    https://github.com/systemd/systemd/issues/9831
2974  * 2) if ipv6ll is disabled, then bringing the interface up must be
2975  *    delayed until after we get confirmation from the kernel that
2976  *    the addr_gen_mode parameter has been set (via netlink), see:
2977  *    https://github.com/systemd/systemd/issues/13882
2978  */
2979 static int link_configure_continue(Link *link) {
2980         int r;
2981
2982         assert(link);
2983         assert(link->network);
2984         assert(link->state == LINK_STATE_INITIALIZED);
2985
2986         if (link->setting_mtu || link->setting_genmode)
2987                 return 0;
2988
2989         /* Drop foreign config, but ignore loopback or critical devices.
2990          * We do not want to remove loopback address or addresses used for root NFS. */
2991         if (!(link->flags & IFF_LOOPBACK) &&
2992             link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
2993                 r = link_drop_foreign_config(link);
2994                 if (r < 0)
2995                         return r;
2996         }
2997
2998         /* The kernel resets ipv6 mtu after changing device mtu;
2999          * we must set this here, after we've set device mtu */
3000         r = link_set_ipv6_mtu(link);
3001         if (r < 0)
3002                 return r;
3003
3004         if (link_has_carrier(link) || link->network->configure_without_carrier) {
3005                 r = link_acquire_conf(link);
3006                 if (r < 0)
3007                         return r;
3008         }
3009
3010         return link_enter_join_netdev(link);
3011 }
3012
3013 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3014         assert(duid);
3015
3016         if (duid->raw_data_len > 0)
3017                 return 0;
3018
3019         if (duid->type != DUID_TYPE_UUID)
3020                 return -EINVAL;
3021
3022         memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3023         duid->raw_data_len = sizeof(sd_id128_t);
3024
3025         return 1;
3026 }
3027
3028 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3029         Manager *manager = userdata;
3030         const sd_bus_error *e;
3031         const void *a;
3032         size_t sz;
3033         DUID *duid;
3034         Link *link;
3035         int r;
3036
3037         assert(m);
3038         assert(manager);
3039
3040         e = sd_bus_message_get_error(m);
3041         if (e) {
3042                 log_error_errno(sd_bus_error_get_errno(e),
3043                                 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3044                                 e->message);
3045                 goto configure;
3046         }
3047
3048         r = sd_bus_message_read_array(m, 'y', &a, &sz);
3049         if (r < 0)
3050                 goto configure;
3051
3052         if (sz != sizeof(sd_id128_t)) {
3053                 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3054                 goto configure;
3055         }
3056
3057         memcpy(&manager->product_uuid, a, sz);
3058         while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3059                 (void) duid_set_uuid(duid, manager->product_uuid);
3060
3061         manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3062
3063 configure:
3064         while ((link = set_steal_first(manager->links_requesting_uuid))) {
3065                 link_unref(link);
3066
3067                 r = link_configure(link);
3068                 if (r < 0)
3069                         link_enter_failed(link);
3070         }
3071
3072         manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3073
3074         /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3075          * even if the method fails. */
3076         manager->has_product_uuid = true;
3077
3078         return 1;
3079 }
3080
3081 static bool link_requires_uuid(Link *link) {
3082         const DUID *duid;
3083
3084         assert(link);
3085         assert(link->manager);
3086         assert(link->network);
3087
3088         duid = link_get_duid(link);
3089         if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3090                 return false;
3091
3092         if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3093                 return true;
3094
3095         if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3096                 return true;
3097
3098         return false;
3099 }
3100
3101 static int link_configure_duid(Link *link) {
3102         Manager *m;
3103         DUID *duid;
3104         int r;
3105
3106         assert(link);
3107         assert(link->manager);
3108         assert(link->network);
3109
3110         m = link->manager;
3111         duid = link_get_duid(link);
3112
3113         if (!link_requires_uuid(link))
3114                 return 1;
3115
3116         if (m->has_product_uuid) {
3117                 (void) duid_set_uuid(duid, m->product_uuid);
3118                 return 1;
3119         }
3120
3121         if (!m->links_requesting_uuid) {
3122                 r = manager_request_product_uuid(m, link);
3123                 if (r < 0) {
3124                         if (r == -ENOMEM)
3125                                 return r;
3126
3127                         log_link_warning_errno(link, r,
3128                                                "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3129                         return 1;
3130                 }
3131         } else {
3132                 r = set_put(m->links_requesting_uuid, link);
3133                 if (r < 0)
3134                         return log_oom();
3135                 if (r > 0)
3136                         link_ref(link);
3137
3138                 r = set_put(m->duids_requesting_uuid, duid);
3139                 if (r < 0)
3140                         return log_oom();
3141         }
3142
3143         return 0;
3144 }
3145
3146 static int link_reconfigure_internal(Link *link, sd_netlink_message *m, bool force) {
3147         Network *network;
3148         int r;
3149
3150         if (m) {
3151                 _cleanup_strv_free_ char **s = NULL;
3152
3153                 r = sd_netlink_message_get_errno(m);
3154                 if (r < 0)
3155                         return r;
3156
3157                 r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3158                 if (r < 0 && r != -ENODATA)
3159                         return r;
3160
3161                 strv_free_and_replace(link->alternative_names, s);
3162         }
3163
3164         r = network_get(link->manager, link->iftype, link->sd_device,
3165                         link->ifname, link->alternative_names, link->driver,
3166                         &link->mac, &link->permanent_mac,
3167                         link->wlan_iftype, link->ssid, &link->bssid, &network);
3168         if (r == -ENOENT) {
3169                 link_enter_unmanaged(link);
3170                 return 0;
3171         } else if (r == 0 && network->unmanaged) {
3172                 link_enter_unmanaged(link);
3173                 return 0;
3174         } else if (r < 0)
3175                 return r;
3176
3177         if (link->network == network && !force)
3178                 return 0;
3179
3180         log_link_info(link, "Re-configuring with %s", network->filename);
3181
3182         /* Dropping old .network file */
3183         r = link_stop_clients(link, false);
3184         if (r < 0)
3185                 return r;
3186
3187         if (link_dhcp4_server_enabled(link))
3188                 (void) sd_dhcp_server_stop(link->dhcp_server);
3189
3190         r = link_drop_config(link);
3191         if (r < 0)
3192                 return r;
3193
3194         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3195                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3196                 r = link_drop_foreign_config(link);
3197                 if (r < 0)
3198                         return r;
3199         }
3200
3201         link_free_carrier_maps(link);
3202         link_free_engines(link);
3203         link->network = network_unref(link->network);
3204
3205         /* Then, apply new .network file */
3206         r = network_apply(network, link);
3207         if (r < 0)
3208                 return r;
3209
3210         r = link_new_carrier_maps(link);
3211         if (r < 0)
3212                 return r;
3213
3214         link_set_state(link, LINK_STATE_INITIALIZED);
3215         link_dirty(link);
3216
3217         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3218          * link_configure() is called later asynchronously. */
3219         r = link_configure_duid(link);
3220         if (r <= 0)
3221                 return r;
3222
3223         r = link_configure(link);
3224         if (r < 0)
3225                 return r;
3226
3227         return 0;
3228 }
3229
3230 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3231         int r;
3232
3233         r = link_reconfigure_internal(link, m, false);
3234         if (r < 0)
3235                 link_enter_failed(link);
3236
3237         return 1;
3238 }
3239
3240 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3241         int r;
3242
3243         r = link_reconfigure_internal(link, m, true);
3244         if (r < 0)
3245                 link_enter_failed(link);
3246
3247         return 1;
3248 }
3249
3250 int link_reconfigure(Link *link, bool force) {
3251         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3252         int r;
3253
3254         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
3255                 return 0;
3256
3257         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3258                                      link->ifindex);
3259         if (r < 0)
3260                 return r;
3261
3262         r = netlink_call_async(link->manager->rtnl, NULL, req,
3263                                force ? link_force_reconfigure_handler : link_reconfigure_handler,
3264                                link_netlink_destroy_callback, link);
3265         if (r < 0)
3266                 return r;
3267
3268         link_ref(link);
3269
3270         return 0;
3271 }
3272
3273 static int link_initialized_and_synced(Link *link) {
3274         Network *network;
3275         int r;
3276
3277         assert(link);
3278         assert(link->ifname);
3279         assert(link->manager);
3280
3281         /* We may get called either from the asynchronous netlink callback,
3282          * or directly for link_add() if running in a container. See link_add(). */
3283         if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
3284                 return 0;
3285
3286         log_link_debug(link, "Link state is up-to-date");
3287         link_set_state(link, LINK_STATE_INITIALIZED);
3288
3289         r = link_new_bound_by_list(link);
3290         if (r < 0)
3291                 return r;
3292
3293         r = link_handle_bound_by_list(link);
3294         if (r < 0)
3295                 return r;
3296
3297         if (!link->network) {
3298                 r = wifi_get_info(link);
3299                 if (r < 0)
3300                         return r;
3301
3302                 r = network_get(link->manager, link->iftype, link->sd_device,
3303                                 link->ifname, link->alternative_names, link->driver,
3304                                 &link->mac, &link->permanent_mac,
3305                                 link->wlan_iftype, link->ssid, &link->bssid, &network);
3306                 if (r == -ENOENT) {
3307                         link_enter_unmanaged(link);
3308                         return 0;
3309                 } else if (r == 0 && network->unmanaged) {
3310                         link_enter_unmanaged(link);
3311                         return 0;
3312                 } else if (r < 0)
3313                         return r;
3314
3315                 if (link->flags & IFF_LOOPBACK) {
3316                         if (network->link_local != ADDRESS_FAMILY_NO)
3317                                 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3318
3319                         if (network->dhcp != ADDRESS_FAMILY_NO)
3320                                 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3321
3322                         if (network->dhcp_server)
3323                                 log_link_debug(link, "Ignoring DHCP server for loopback link");
3324                 }
3325
3326                 r = network_apply(network, link);
3327                 if (r < 0)
3328                         return r;
3329         }
3330
3331         r = link_new_bound_to_list(link);
3332         if (r < 0)
3333                 return r;
3334
3335         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3336          * link_configure() is called later asynchronously. */
3337         r = link_configure_duid(link);
3338         if (r <= 0)
3339                 return r;
3340
3341         r = link_configure(link);
3342         if (r < 0)
3343                 return r;
3344
3345         return 0;
3346 }
3347
3348 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3349         _cleanup_strv_free_ char **s = NULL;
3350         int r;
3351
3352         r = sd_netlink_message_get_errno(m);
3353         if (r < 0) {
3354                 log_link_warning_errno(link, r, "Failed to wait for the interface to be initialized: %m");
3355                 link_enter_failed(link);
3356                 return 0;
3357         }
3358
3359         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3360         if (r < 0 && r != -ENODATA) {
3361                 link_enter_failed(link);
3362                 return 0;
3363         }
3364
3365         strv_free_and_replace(link->alternative_names, s);
3366
3367         r = link_initialized_and_synced(link);
3368         if (r < 0)
3369                 link_enter_failed(link);
3370         return 1;
3371 }
3372
3373 int link_initialized(Link *link, sd_device *device) {
3374         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3375         int r;
3376
3377         assert(link);
3378         assert(link->manager);
3379         assert(link->manager->rtnl);
3380         assert(device);
3381
3382         if (link->state != LINK_STATE_PENDING)
3383                 return 0;
3384
3385         if (link->sd_device)
3386                 return 0;
3387
3388         log_link_debug(link, "udev initialized link");
3389         link_set_state(link, LINK_STATE_INITIALIZED);
3390
3391         link->sd_device = sd_device_ref(device);
3392
3393         /* udev has initialized the link, but we don't know if we have yet
3394          * processed the NEWLINK messages with the latest state. Do a GETLINK,
3395          * when it returns we know that the pending NEWLINKs have already been
3396          * processed and that we are up-to-date */
3397
3398         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3399                                      link->ifindex);
3400         if (r < 0)
3401                 return r;
3402
3403         r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3404                                link_netlink_destroy_callback, link);
3405         if (r < 0)
3406                 return r;
3407
3408         link_ref(link);
3409
3410         return 0;
3411 }
3412
3413 static int link_load(Link *link) {
3414         _cleanup_free_ char *network_file = NULL,
3415                             *addresses = NULL,
3416                             *routes = NULL,
3417                             *dhcp4_address = NULL,
3418                             *ipv4ll_address = NULL;
3419         union in_addr_union address;
3420         const char *p;
3421         int r;
3422
3423         assert(link);
3424
3425         r = parse_env_file(NULL, link->state_file,
3426                            "NETWORK_FILE", &network_file,
3427                            "ADDRESSES", &addresses,
3428                            "ROUTES", &routes,
3429                            "DHCP4_ADDRESS", &dhcp4_address,
3430                            "IPV4LL_ADDRESS", &ipv4ll_address);
3431         if (r < 0 && r != -ENOENT)
3432                 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3433
3434         if (network_file) {
3435                 Network *network;
3436                 char *suffix;
3437
3438                 /* drop suffix */
3439                 suffix = strrchr(network_file, '.');
3440                 if (!suffix) {
3441                         log_link_debug(link, "Failed to get network name from %s", network_file);
3442                         goto network_file_fail;
3443                 }
3444                 *suffix = '\0';
3445
3446                 r = network_get_by_name(link->manager, basename(network_file), &network);
3447                 if (r < 0) {
3448                         log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3449                         goto network_file_fail;
3450                 }
3451
3452                 r = network_apply(network, link);
3453                 if (r < 0)
3454                         return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3455         }
3456
3457 network_file_fail:
3458
3459         if (addresses) {
3460                 p = addresses;
3461
3462                 for (;;) {
3463                         _cleanup_free_ char *address_str = NULL;
3464                         char *prefixlen_str;
3465                         int family;
3466                         unsigned char prefixlen;
3467
3468                         r = extract_first_word(&p, &address_str, NULL, 0);
3469                         if (r < 0) {
3470                                 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3471                                 continue;
3472                         }
3473                         if (r == 0)
3474                                 break;
3475
3476                         prefixlen_str = strchr(address_str, '/');
3477                         if (!prefixlen_str) {
3478                                 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3479                                 continue;
3480                         }
3481
3482                         *prefixlen_str++ = '\0';
3483
3484                         r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3485                         if (r != 1) {
3486                                 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3487                                 continue;
3488                         }
3489
3490                         r = in_addr_from_string_auto(address_str, &family, &address);
3491                         if (r < 0) {
3492                                 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3493                                 continue;
3494                         }
3495
3496                         r = address_add(link, family, &address, prefixlen, NULL);
3497                         if (r < 0)
3498                                 return log_link_error_errno(link, r, "Failed to add address: %m");
3499                 }
3500         }
3501
3502         if (routes) {
3503                 p = routes;
3504
3505                 for (;;) {
3506                         _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3507                         _cleanup_(route_freep) Route *tmp = NULL;
3508                         _cleanup_free_ char *route_str = NULL;
3509                         char *prefixlen_str;
3510                         Route *route;
3511
3512                         r = extract_first_word(&p, &route_str, NULL, 0);
3513                         if (r < 0) {
3514                                 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3515                                 continue;
3516                         }
3517                         if (r == 0)
3518                                 break;
3519
3520                         prefixlen_str = strchr(route_str, '/');
3521                         if (!prefixlen_str) {
3522                                 log_link_debug(link, "Failed to parse route %s", route_str);
3523                                 continue;
3524                         }
3525
3526                         *prefixlen_str++ = '\0';
3527
3528                         r = route_new(&tmp);
3529                         if (r < 0)
3530                                 return log_oom();
3531
3532                         r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%"PRIu32"/"USEC_FMT, &tmp->dst_prefixlen, &tmp->tos, &tmp->priority, &tmp->table, &tmp->lifetime);
3533                         if (r != 5) {
3534                                 log_link_debug(link,
3535                                                "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3536                                                prefixlen_str);
3537                                 continue;
3538                         }
3539
3540                         r = in_addr_from_string_auto(route_str, &tmp->family, &tmp->dst);
3541                         if (r < 0) {
3542                                 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3543                                 continue;
3544                         }
3545
3546                         r = route_add(link, tmp, &route);
3547                         if (r < 0)
3548                                 return log_link_error_errno(link, r, "Failed to add route: %m");
3549
3550                         if (route->lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3551                                 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), route->lifetime,
3552                                                       0, route_expire_handler, route);
3553                                 if (r < 0)
3554                                         log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3555                         }
3556
3557                         sd_event_source_unref(route->expire);
3558                         route->expire = TAKE_PTR(expire);
3559                 }
3560         }
3561
3562         if (dhcp4_address) {
3563                 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3564                 if (r < 0) {
3565                         log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3566                         goto dhcp4_address_fail;
3567                 }
3568
3569                 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3570                 if (r < 0)
3571                         return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3572
3573                 r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
3574                 if (r < 0)
3575                         return log_link_error_errno(link, r, "Failed to attach DHCPv4 event: %m");
3576
3577                 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3578                 if (r < 0)
3579                         return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3580         }
3581
3582 dhcp4_address_fail:
3583
3584         if (ipv4ll_address) {
3585                 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3586                 if (r < 0) {
3587                         log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3588                         goto ipv4ll_address_fail;
3589                 }
3590
3591                 r = sd_ipv4ll_new(&link->ipv4ll);
3592                 if (r < 0)
3593                         return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3594
3595                 r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
3596                 if (r < 0)
3597                         return log_link_error_errno(link, r, "Failed to attach IPv4LL event: %m");
3598
3599                 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3600                 if (r < 0)
3601                         return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3602         }
3603
3604 ipv4ll_address_fail:
3605
3606         return 0;
3607 }
3608
3609 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3610         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3611         char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3612         Link *link;
3613         int r;
3614
3615         assert(m);
3616         assert(m->rtnl);
3617         assert(message);
3618         assert(ret);
3619
3620         r = link_new(m, message, ret);
3621         if (r < 0)
3622                 return r;
3623
3624         link = *ret;
3625
3626         log_link_debug(link, "Link %d added", link->ifindex);
3627
3628         r = link_load(link);
3629         if (r < 0)
3630                 return r;
3631
3632         if (path_is_read_only_fs("/sys") <= 0) {
3633                 /* udev should be around */
3634                 sprintf(ifindex_str, "n%d", link->ifindex);
3635                 r = sd_device_new_from_device_id(&device, ifindex_str);
3636                 if (r < 0) {
3637                         log_link_warning_errno(link, r, "Could not find device, waiting for device initialization: %m");
3638                         return 0;
3639                 }
3640
3641                 r = sd_device_get_is_initialized(device);
3642                 if (r < 0) {
3643                         log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
3644                         goto failed;
3645                 }
3646                 if (r == 0) {
3647                         /* not yet ready */
3648                         log_link_debug(link, "link pending udev initialization...");
3649                         return 0;
3650                 }
3651
3652                 r = device_is_renaming(device);
3653                 if (r < 0) {
3654                         log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
3655                         goto failed;
3656                 }
3657                 if (r > 0) {
3658                         log_link_debug(link, "Interface is being renamed, pending initialization.");
3659                         return 0;
3660                 }
3661
3662                 r = link_initialized(link, device);
3663                 if (r < 0)
3664                         goto failed;
3665         } else {
3666                 r = link_initialized_and_synced(link);
3667                 if (r < 0)
3668                         goto failed;
3669         }
3670
3671         return 0;
3672 failed:
3673         link_enter_failed(link);
3674         return r;
3675 }
3676
3677 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3678         int r;
3679
3680         assert(link);
3681
3682         log_link_info(link, "Gained IPv6LL");
3683
3684         link->ipv6ll_address = *address;
3685         link_check_ready(link);
3686
3687         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3688                 r = link_acquire_ipv6_conf(link);
3689                 if (r < 0) {
3690                         link_enter_failed(link);
3691                         return r;
3692                 }
3693         }
3694
3695         return 0;
3696 }
3697
3698 static int link_carrier_gained(Link *link) {
3699         int r;
3700
3701         assert(link);
3702
3703         r = wifi_get_info(link);
3704         if (r < 0)
3705                 return r;
3706         if (r > 0) {
3707                 r = link_reconfigure_internal(link, NULL, false);
3708                 if (r < 0) {
3709                         link_enter_failed(link);
3710                         return r;
3711                 }
3712         }
3713
3714         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3715                 r = link_acquire_conf(link);
3716                 if (r < 0) {
3717                         link_enter_failed(link);
3718                         return r;
3719                 }
3720
3721                 link_set_state(link, LINK_STATE_CONFIGURING);
3722                 r = link_request_set_addresses(link);
3723                 if (r < 0)
3724                         return r;
3725         }
3726
3727         r = link_handle_bound_by_list(link);
3728         if (r < 0)
3729                 return r;
3730
3731         return 0;
3732 }
3733
3734 static int link_carrier_lost(Link *link) {
3735         int r;
3736
3737         assert(link);
3738
3739         if (link->network && link->network->ignore_carrier_loss)
3740                 return 0;
3741
3742         /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3743          * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3744          * configuration and stop the clients as well. */
3745         if (link->setting_mtu)
3746                 return 0;
3747
3748         r = link_stop_clients(link, false);
3749         if (r < 0) {
3750                 link_enter_failed(link);
3751                 return r;
3752         }
3753
3754         if (link_dhcp4_server_enabled(link))
3755                 (void) sd_dhcp_server_stop(link->dhcp_server);
3756
3757         r = link_drop_config(link);
3758         if (r < 0)
3759                 return r;
3760
3761         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3762                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3763                 r = link_drop_foreign_config(link);
3764                 if (r < 0)
3765                         return r;
3766         }
3767
3768         r = link_handle_bound_by_list(link);
3769         if (r < 0)
3770                 return r;
3771
3772         return 0;
3773 }
3774
3775 int link_carrier_reset(Link *link) {
3776         int r;
3777
3778         assert(link);
3779
3780         if (link_has_carrier(link)) {
3781                 r = link_carrier_lost(link);
3782                 if (r < 0)
3783                         return r;
3784
3785                 r = link_carrier_gained(link);
3786                 if (r < 0)
3787                         return r;
3788
3789                 log_link_info(link, "Reset carrier");
3790         }
3791
3792         return 0;
3793 }
3794
3795 /* This is called every time an interface admin state changes to up;
3796  * specifically, when IFF_UP flag changes from unset to set */
3797 static int link_admin_state_up(Link *link) {
3798         int r;
3799
3800         /* We set the ipv6 mtu after the device mtu, but the kernel resets
3801          * ipv6 mtu on NETDEV_UP, so we need to reset it.  The check for
3802          * ipv6_mtu_set prevents this from trying to set it too early before
3803          * the link->network has been setup; we only need to reset it
3804          * here if we've already set it during normal initialization. */
3805         if (link->ipv6_mtu_set) {
3806                 r = link_set_ipv6_mtu(link);
3807                 if (r < 0)
3808                         return r;
3809         }
3810
3811         return 0;
3812 }
3813
3814 int link_update(Link *link, sd_netlink_message *m) {
3815         _cleanup_strv_free_ char **s = NULL;
3816         struct ether_addr mac;
3817         const char *ifname;
3818         uint32_t mtu;
3819         bool had_carrier, carrier_gained, carrier_lost, link_was_admin_up;
3820         int old_master, r;
3821
3822         assert(link);
3823         assert(link->ifname);
3824         assert(m);
3825
3826         if (link->state == LINK_STATE_LINGER) {
3827                 log_link_info(link, "Link re-added");
3828                 link_set_state(link, LINK_STATE_CONFIGURING);
3829
3830                 r = link_new_carrier_maps(link);
3831                 if (r < 0)
3832                         return r;
3833         }
3834
3835         r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3836         if (r >= 0 && !streq(ifname, link->ifname)) {
3837                 Manager *manager = link->manager;
3838
3839                 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3840
3841                 link_drop(link);
3842                 r = link_add(manager, m, &link);
3843                 if (r < 0)
3844                         return r;
3845         }
3846
3847         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3848         if (r >= 0)
3849                 strv_free_and_replace(link->alternative_names, s);
3850
3851         r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3852         if (r >= 0 && mtu > 0) {
3853                 link->mtu = mtu;
3854                 if (link->original_mtu == 0) {
3855                         link->original_mtu = mtu;
3856                         log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3857                 }
3858
3859                 if (link->dhcp_client) {
3860                         r = sd_dhcp_client_set_mtu(link->dhcp_client,
3861                                                    link->mtu);
3862                         if (r < 0)
3863                                 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3864                 }
3865
3866                 if (link->radv) {
3867                         r = sd_radv_set_mtu(link->radv, link->mtu);
3868                         if (r < 0)
3869                                 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3870                 }
3871         }
3872
3873         /* The kernel may broadcast NEWLINK messages without the MAC address
3874            set, simply ignore them. */
3875         r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3876         if (r >= 0) {
3877                 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3878                            ETH_ALEN)) {
3879
3880                         memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3881                                ETH_ALEN);
3882
3883                         log_link_debug(link, "MAC address: "
3884                                        "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3885                                        mac.ether_addr_octet[0],
3886                                        mac.ether_addr_octet[1],
3887                                        mac.ether_addr_octet[2],
3888                                        mac.ether_addr_octet[3],
3889                                        mac.ether_addr_octet[4],
3890                                        mac.ether_addr_octet[5]);
3891
3892                         if (link->ipv4ll) {
3893                                 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3894                                 if (r < 0)
3895                                         return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3896                         }
3897
3898                         if (link->dhcp_client) {
3899                                 r = sd_dhcp_client_set_mac(link->dhcp_client,
3900                                                            (const uint8_t *) &link->mac,
3901                                                            sizeof (link->mac),
3902                                                            ARPHRD_ETHER);
3903                                 if (r < 0)
3904                                         return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3905
3906                                 r = dhcp4_set_client_identifier(link);
3907                                 if (r < 0)
3908                                         return r;
3909                         }
3910
3911                         if (link->dhcp6_client) {
3912                                 const DUID* duid = link_get_duid(link);
3913
3914                                 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3915                                                             (const uint8_t *) &link->mac,
3916                                                             sizeof (link->mac),
3917                                                             ARPHRD_ETHER);
3918                                 if (r < 0)
3919                                         return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3920
3921                                 if (link->network->iaid_set) {
3922                                         r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3923                                                                      link->network->iaid);
3924                                         if (r < 0)
3925                                                 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3926                                 }
3927
3928                                 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3929                                                              duid->type,
3930                                                              duid->raw_data_len > 0 ? duid->raw_data : NULL,
3931                                                              duid->raw_data_len);
3932                                 if (r < 0)
3933                                         return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3934                         }
3935
3936                         if (link->radv) {
3937                                 r = sd_radv_set_mac(link->radv, &link->mac);
3938                                 if (r < 0)
3939                                         return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3940                         }
3941
3942                         if (link->ndisc) {
3943                                 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3944                                 if (r < 0)
3945                                         return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3946                         }
3947                 }
3948         }
3949
3950         old_master = link->master_ifindex;
3951         (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
3952
3953         link_was_admin_up = link->flags & IFF_UP;
3954         had_carrier = link_has_carrier(link);
3955
3956         r = link_update_flags(link, m, old_master != link->master_ifindex);
3957         if (r < 0)
3958                 return r;
3959
3960         if (!link_was_admin_up && (link->flags & IFF_UP)) {
3961                 log_link_info(link, "Link UP");
3962
3963                 r = link_admin_state_up(link);
3964                 if (r < 0)
3965                         return r;
3966         } else if (link_was_admin_up && !(link->flags & IFF_UP))
3967                 log_link_info(link, "Link DOWN");
3968
3969         r = link_update_lldp(link);
3970         if (r < 0)
3971                 return r;
3972
3973         carrier_gained = !had_carrier && link_has_carrier(link);
3974         carrier_lost = had_carrier && !link_has_carrier(link);
3975
3976         if (carrier_gained) {
3977                 log_link_info(link, "Gained carrier");
3978
3979                 r = link_carrier_gained(link);
3980                 if (r < 0)
3981                         return r;
3982         } else if (carrier_lost) {
3983                 log_link_info(link, "Lost carrier");
3984
3985                 r = link_carrier_lost(link);
3986                 if (r < 0)
3987                         return r;
3988         }
3989
3990         return 0;
3991 }
3992
3993 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3994         bool space = false;
3995         Iterator i;
3996         Link *link;
3997
3998         assert(f);
3999         assert(prefix);
4000
4001         if (hashmap_isempty(h))
4002                 return;
4003
4004         fputs(prefix, f);
4005         HASHMAP_FOREACH(link, h, i) {
4006                 if (space)
4007                         fputc(' ', f);
4008
4009                 fprintf(f, "%i", link->ifindex);
4010                 space = true;
4011         }
4012
4013         fputc('\n', f);
4014 }
4015
4016 static void link_save_dns(FILE *f, struct in_addr_data *dns, unsigned n_dns, bool *space) {
4017         for (unsigned j = 0; j < n_dns; j++) {
4018                 _cleanup_free_ char *b = NULL;
4019                 int r;
4020
4021                 r = in_addr_to_string(dns[j].family, &dns[j].address, &b);
4022                 if (r < 0) {
4023                         log_debug_errno(r, "Failed to format address, ignoring: %m");
4024                         continue;
4025                 }
4026
4027                 if (*space)
4028                         fputc(' ', f);
4029                 fputs(b, f);
4030                 *space = true;
4031         }
4032 }
4033
4034 static void serialize_addresses(
4035                 FILE *f,
4036                 const char *lvalue,
4037                 bool *space,
4038                 char **addresses,
4039                 sd_dhcp_lease *lease,
4040                 bool conditional,
4041                 sd_dhcp_lease_server_type what,
4042                 sd_dhcp6_lease *lease6,
4043                 bool conditional6,
4044                 int (*lease6_get_addr)(sd_dhcp6_lease*, const struct in6_addr**),
4045                 int (*lease6_get_fqdn)(sd_dhcp6_lease*, char ***)) {
4046         int r;
4047
4048         bool _space = false;
4049         if (!space)
4050                 space = &_space;
4051
4052         if (lvalue)
4053                 fprintf(f, "%s=", lvalue);
4054         fputstrv(f, addresses, NULL, space);
4055
4056         if (lease && conditional) {
4057                 const struct in_addr *lease_addresses;
4058
4059                 r = sd_dhcp_lease_get_servers(lease, what, &lease_addresses);
4060                 if (r > 0)
4061                         serialize_in_addrs(f, lease_addresses, r, space, in4_addr_is_non_local);
4062         }
4063
4064         if (lease6 && conditional6 && lease6_get_addr) {
4065                 const struct in6_addr *in6_addrs;
4066
4067                 r = lease6_get_addr(lease6, &in6_addrs);
4068                 if (r > 0)
4069                         serialize_in6_addrs(f, in6_addrs, r, space);
4070         }
4071
4072         if (lease6 && conditional6 && lease6_get_fqdn) {
4073                 char **in6_hosts;
4074
4075                 r = lease6_get_fqdn(lease6, &in6_hosts);
4076                 if (r > 0)
4077                         fputstrv(f, in6_hosts, NULL, space);
4078         }
4079
4080         if (lvalue)
4081                 fputc('\n', f);
4082 }
4083
4084 int link_save(Link *link) {
4085         const char *admin_state, *oper_state, *carrier_state, *address_state;
4086         _cleanup_free_ char *temp_path = NULL;
4087         _cleanup_fclose_ FILE *f = NULL;
4088         Route *route;
4089         Address *a;
4090         Iterator i;
4091         int r;
4092
4093         assert(link);
4094         assert(link->state_file);
4095         assert(link->lease_file);
4096         assert(link->manager);
4097
4098         if (link->state == LINK_STATE_LINGER) {
4099                 (void) unlink(link->state_file);
4100                 return 0;
4101         }
4102
4103         link_lldp_save(link);
4104
4105         admin_state = link_state_to_string(link->state);
4106         assert(admin_state);
4107
4108         oper_state = link_operstate_to_string(link->operstate);
4109         assert(oper_state);
4110
4111         carrier_state = link_carrier_state_to_string(link->carrier_state);
4112         assert(carrier_state);
4113
4114         address_state = link_address_state_to_string(link->address_state);
4115         assert(address_state);
4116
4117         r = fopen_temporary(link->state_file, &f, &temp_path);
4118         if (r < 0)
4119                 goto fail;
4120
4121         (void) fchmod(fileno(f), 0644);
4122
4123         fprintf(f,
4124                 "# This is private data. Do not parse.\n"
4125                 "ADMIN_STATE=%s\n"
4126                 "OPER_STATE=%s\n"
4127                 "CARRIER_STATE=%s\n"
4128                 "ADDRESS_STATE=%s\n",
4129                 admin_state, oper_state, carrier_state, address_state);
4130
4131         if (link->network) {
4132                 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
4133                 const char *dhcp_domainname = NULL, *p;
4134                 sd_dhcp6_lease *dhcp6_lease = NULL;
4135                 bool space;
4136
4137                 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4138                         yes_no(link->network->required_for_online));
4139
4140                 LinkOperationalStateRange st = link->network->required_operstate_for_online;
4141                 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s%s%s\n",
4142                         strempty(link_operstate_to_string(st.min)),
4143                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? ":" : "",
4144                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? strempty(link_operstate_to_string(st.max)) : "");
4145
4146                 if (link->dhcp6_client) {
4147                         r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
4148                         if (r < 0 && r != -ENOMSG)
4149                                 log_link_debug_errno(link, r, "Failed to get DHCPv6 lease: %m");
4150                 }
4151
4152                 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4153
4154                 /************************************************************/
4155
4156                 fputs("DNS=", f);
4157                 space = false;
4158                 if (link->n_dns != (unsigned) -1)
4159                         link_save_dns(f, link->dns, link->n_dns, &space);
4160                 else
4161                         link_save_dns(f, link->network->dns, link->network->n_dns, &space);
4162
4163                 serialize_addresses(f, NULL, &space,
4164                                     NULL,
4165                                     link->dhcp_lease,
4166                                     link->network->dhcp_use_dns,
4167                                     SD_DHCP_LEASE_DNS,
4168                                     dhcp6_lease,
4169                                     link->network->dhcp6_use_dns,
4170                                     sd_dhcp6_lease_get_dns,
4171                                     NULL);
4172
4173                 /* Make sure to flush out old entries before we use the NDISC data */
4174                 ndisc_vacuum(link);
4175
4176                 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4177                         NDiscRDNSS *dd;
4178
4179                         SET_FOREACH(dd, link->ndisc_rdnss, i)
4180                                 serialize_in6_addrs(f, &dd->address, 1, &space);
4181                 }
4182
4183                 fputc('\n', f);
4184
4185                 /************************************************************/
4186
4187                 serialize_addresses(f, "NTP", NULL,
4188                                     link->ntp ?: link->network->ntp,
4189                                     link->dhcp_lease,
4190                                     link->network->dhcp_use_ntp,
4191                                     SD_DHCP_LEASE_NTP,
4192                                     dhcp6_lease,
4193                                     link->network->dhcp6_use_ntp,
4194                                     sd_dhcp6_lease_get_ntp_addrs,
4195                                     sd_dhcp6_lease_get_ntp_fqdn);
4196
4197                 serialize_addresses(f, "SIP", NULL,
4198                                     NULL,
4199                                     link->dhcp_lease,
4200                                     link->network->dhcp_use_sip,
4201                                     SD_DHCP_LEASE_SIP,
4202                                     NULL, false, NULL, NULL);
4203
4204                 /************************************************************/
4205
4206                 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4207                         if (link->dhcp_lease) {
4208                                 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4209                                 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4210                         }
4211                         if (dhcp6_lease)
4212                                 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4213                 }
4214
4215                 fputs("DOMAINS=", f);
4216                 space = false;
4217                 ORDERED_SET_FOREACH(p, link->search_domains ?: link->network->search_domains, i)
4218                         fputs_with_space(f, p, NULL, &space);
4219
4220                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4221                         if (dhcp_domainname)
4222                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4223                         if (dhcp_domains)
4224                                 fputstrv(f, dhcp_domains, NULL, &space);
4225                         if (dhcp6_domains)
4226                                 fputstrv(f, dhcp6_domains, NULL, &space);
4227                 }
4228
4229                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_YES) {
4230                         NDiscDNSSL *dd;
4231
4232                         SET_FOREACH(dd, link->ndisc_dnssl, i)
4233                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4234                 }
4235
4236                 fputc('\n', f);
4237
4238                 /************************************************************/
4239
4240                 fputs("ROUTE_DOMAINS=", f);
4241                 space = false;
4242                 ORDERED_SET_FOREACH(p, link->route_domains ?: link->network->route_domains, i)
4243                         fputs_with_space(f, p, NULL, &space);
4244
4245                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4246                         if (dhcp_domainname)
4247                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4248                         if (dhcp_domains)
4249                                 fputstrv(f, dhcp_domains, NULL, &space);
4250                         if (dhcp6_domains)
4251                                 fputstrv(f, dhcp6_domains, NULL, &space);
4252                 }
4253
4254                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4255                         NDiscDNSSL *dd;
4256
4257                         SET_FOREACH(dd, link->ndisc_dnssl, i)
4258                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4259                 }
4260
4261                 fputc('\n', f);
4262
4263                 /************************************************************/
4264
4265                 fprintf(f, "LLMNR=%s\n",
4266                         resolve_support_to_string(link->llmnr >= 0 ? link->llmnr : link->network->llmnr));
4267
4268                 /************************************************************/
4269
4270                 fprintf(f, "MDNS=%s\n",
4271                         resolve_support_to_string(link->mdns >= 0 ? link->mdns : link->network->mdns));
4272
4273                 /************************************************************/
4274
4275                 int dns_default_route =
4276                         link->dns_default_route >= 0 ? link->dns_default_route :
4277                         link->network->dns_default_route;
4278                 if (dns_default_route >= 0)
4279                         fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(dns_default_route));
4280
4281                 /************************************************************/
4282
4283                 DnsOverTlsMode dns_over_tls_mode =
4284                         link->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID ? link->dns_over_tls_mode :
4285                         link->network->dns_over_tls_mode;
4286                 if (dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4287                         fprintf(f, "DNS_OVER_TLS=%s\n", dns_over_tls_mode_to_string(dns_over_tls_mode));
4288
4289                 /************************************************************/
4290
4291                 DnssecMode dnssec_mode =
4292                         link->dnssec_mode != _DNSSEC_MODE_INVALID ? link->dnssec_mode :
4293                         link->network->dnssec_mode;
4294                 if (dnssec_mode != _DNSSEC_MODE_INVALID)
4295                         fprintf(f, "DNSSEC=%s\n", dnssec_mode_to_string(dnssec_mode));
4296
4297                 /************************************************************/
4298
4299                 Set *nta_anchors = link->dnssec_negative_trust_anchors;
4300                 if (set_isempty(nta_anchors))
4301                         nta_anchors = link->network->dnssec_negative_trust_anchors;
4302
4303                 if (!set_isempty(nta_anchors)) {
4304                         const char *n;
4305
4306                         fputs("DNSSEC_NTA=", f);
4307                         space = false;
4308                         SET_FOREACH(n, nta_anchors, i)
4309                                 fputs_with_space(f, n, NULL, &space);
4310                         fputc('\n', f);
4311                 }
4312
4313                 /************************************************************/
4314
4315                 fputs("ADDRESSES=", f);
4316                 space = false;
4317                 SET_FOREACH(a, link->addresses, i) {
4318                         _cleanup_free_ char *address_str = NULL;
4319
4320                         r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4321                         if (r < 0)
4322                                 goto fail;
4323
4324                         fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4325                         space = true;
4326                 }
4327                 fputc('\n', f);
4328
4329                 /************************************************************/
4330
4331                 fputs("ROUTES=", f);
4332                 space = false;
4333                 SET_FOREACH(route, link->routes, i) {
4334                         _cleanup_free_ char *route_str = NULL;
4335
4336                         r = in_addr_to_string(route->family, &route->dst, &route_str);
4337                         if (r < 0)
4338                                 goto fail;
4339
4340                         fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4341                                 space ? " " : "", route_str,
4342                                 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4343                         space = true;
4344                 }
4345
4346                 fputc('\n', f);
4347         }
4348
4349         print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4350         print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4351
4352         if (link->dhcp_lease) {
4353                 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4354                 if (r < 0)
4355                         goto fail;
4356
4357                 fprintf(f,
4358                         "DHCP_LEASE=%s\n",
4359                         link->lease_file);
4360         } else
4361                 (void) unlink(link->lease_file);
4362
4363         if (link->ipv4ll) {
4364                 struct in_addr address;
4365
4366                 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4367                 if (r >= 0) {
4368                         fputs("IPV4LL_ADDRESS=", f);
4369                         serialize_in_addrs(f, &address, 1, false, NULL);
4370                         fputc('\n', f);
4371                 }
4372         }
4373
4374         if (link->dhcp6_client) {
4375                 _cleanup_free_ char *duid = NULL;
4376                 uint32_t iaid;
4377
4378                 r = sd_dhcp6_client_get_iaid(link->dhcp6_client, &iaid);
4379                 if (r >= 0)
4380                         fprintf(f, "DHCP6_CLIENT_IAID=0x%x\n", iaid);
4381
4382                 r = sd_dhcp6_client_duid_as_string(link->dhcp6_client, &duid);
4383                 if (r >= 0)
4384                         fprintf(f, "DHCP6_CLIENT_DUID=%s\n", duid);
4385         }
4386
4387         r = fflush_and_check(f);
4388         if (r < 0)
4389                 goto fail;
4390
4391         if (rename(temp_path, link->state_file) < 0) {
4392                 r = -errno;
4393                 goto fail;
4394         }
4395
4396         return 0;
4397
4398 fail:
4399         (void) unlink(link->state_file);
4400         if (temp_path)
4401                 (void) unlink(temp_path);
4402
4403         return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4404 }
4405
4406 /* The serialized state in /run is no longer up-to-date. */
4407 void link_dirty(Link *link) {
4408         int r;
4409
4410         assert(link);
4411
4412         /* mark manager dirty as link is dirty */
4413         manager_dirty(link->manager);
4414
4415         r = set_ensure_put(&link->manager->dirty_links, NULL, link);
4416         if (r <= 0)
4417                 /* Ignore allocation errors and don't take another ref if the link was already dirty */
4418                 return;
4419         link_ref(link);
4420 }
4421
4422 /* The serialized state in /run is up-to-date */
4423 void link_clean(Link *link) {
4424         assert(link);
4425         assert(link->manager);
4426
4427         link_unref(set_remove(link->manager->dirty_links, link));
4428 }
4429
4430 static const char* const link_state_table[_LINK_STATE_MAX] = {
4431         [LINK_STATE_PENDING] = "pending",
4432         [LINK_STATE_INITIALIZED] = "initialized",
4433         [LINK_STATE_CONFIGURING] = "configuring",
4434         [LINK_STATE_CONFIGURED] = "configured",
4435         [LINK_STATE_UNMANAGED] = "unmanaged",
4436         [LINK_STATE_FAILED] = "failed",
4437         [LINK_STATE_LINGER] = "linger",
4438 };
4439
4440 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
4441
4442 int log_link_message_full_errno(Link *link, sd_netlink_message *m, int level, int err, const char *msg) {
4443         const char *err_msg = NULL;
4444
4445         (void) sd_netlink_message_read_string(m, NLMSGERR_ATTR_MSG, &err_msg);
4446         return log_link_full(link, level, err,
4447                              "%s: %s%s%s%m",
4448                              msg,
4449                              strempty(err_msg),
4450                              err_msg && !endswith(err_msg, ".") ? "." : "",
4451                              err_msg ? " " : "");
4452 }